Update mailparse to parse names with comma

use new URL format and service provided by mailadm
implement dc_set_config_from_qr()
2026-04-02 13:32:11 +03:00 · 2020-02-12 23:08:45 +03:00 · 2020-02-11 22:48:24 +01:00 · 2020-02-11 21:04:18 +01:00 · 2020-02-11 21:04:18 +01:00 · 2020-02-11 21:04:18 +01:00
131 changed files with 10970 additions and 6502 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -36,12 +36,6 @@ jobs:
    executor: default
    steps:
      - checkout
-      - run:
-          name: Update submodules
-          command: git submodule update --init --recursive
-      - run:
-          name: Calculate dependencies
-          command: cargo generate-lockfile
      - restore_cache:
          keys:
            - cargo-v3-{{ checksum "rust-toolchain" }}-{{ checksum "Cargo.toml" }}-{{ checksum "Cargo.lock" }}-{{ arch }}
@@ -49,7 +43,6 @@ jobs:
      - run: rustup default $(cat rust-toolchain)
      - run: rustup component add --toolchain $(cat rust-toolchain) rustfmt
      - run: rustup component add --toolchain $(cat rust-toolchain) clippy-preview
-      - run: cargo update
      - run: cargo fetch
      - run: rustc +stable --version
      - run: rustc +$(cat rust-toolchain) --version
@@ -91,7 +84,6 @@ jobs:
            curl https://sh.rustup.rs -sSf | sh -s -- -y
      - run: rustup install $(cat rust-toolchain)
      - run: rustup default $(cat rust-toolchain)
-      - run: cargo update
      - run: cargo fetch
      - run:
          name: Test
@@ -128,32 +120,19 @@ jobs:
          paths:
            - c-docs

-  # build_test_docs_wheel:
-  #   docker:
-  #     - image: deltachat/coredeps
-  #       environment:
-  #           TESTS: 1
-  #           DOCS: 1
-  #   working_directory: /mnt/crate
-  #   steps:
-  #     - *restore-workspace
-  #     - *restore-cache
-  #     - run:
-  #         name: build docs, run tests and build wheels
-  #         command: ci_scripts/run-python.sh
-  #     - run:
-  #          name: copying docs and wheels to workspace
-  #          command: |
-  #            mkdir -p workspace/python
-  #            # cp -av docs workspace/c-docs
-  #            cp -av python/.docker-tox/wheelhouse workspace/
-  #            cp -av python/doc/_build/ workspace/py-docs
-  #     - persist_to_workspace:
-  #         root: workspace
-  #         paths:
-  #           # - c-docs
-  #           - py-docs
-  #           - wheelhouse
+  remote_python_packaging:
+    machine: true
+    steps:
+      - checkout
+      # the following commands on success produces
+      # workspace/{wheelhouse,py-docs} as artefact directories
+      - run: bash ci_scripts/remote_python_packaging.sh 
+      - persist_to_workspace:
+          root: workspace
+          paths:
+            # - c-docs
+            - py-docs
+            - wheelhouse

  remote_tests_rust:
    machine: true
@@ -165,10 +144,7 @@ jobs:
    machine: true
    steps:
      - checkout
-      #- attach_workspace:
-      #    at: workspace
      - run: ci_scripts/remote_tests_python.sh
-    # workspace/py-docs workspace/wheelhouse workspace/c-docs

  upload_docs_wheels:
    machine: true
@@ -176,6 +152,7 @@ jobs:
      - checkout
      - attach_workspace:
          at: workspace
+      - run: pyenv versions
      - run: pyenv global 3.5.2
      - run: ls -laR workspace
      - run: ci_scripts/ci_upload.sh workspace/py-docs workspace/wheelhouse workspace/c-docs
@@ -187,7 +164,7 @@ jobs:
      - *restore-cache
      - run:
          name: Run cargo clippy
-          command: cargo clippy --all
+          command: cargo clippy 


 workflows:
@@ -195,24 +172,44 @@ workflows:

  test:
    jobs:
-      - cargo_fetch
+      # - cargo_fetch

-      - remote_tests_rust
+      - remote_tests_rust:
+          filters:
+            tags:
+              only: /.*/

-      - remote_tests_python
+      - remote_tests_python:
+          filters:
+            tags:
+              only: /.*/

-      # - upload_docs_wheels:
+      - remote_python_packaging:
+          requires: 
+             - remote_tests_python
+             - remote_tests_rust 
+          filters:
+            tags:
+              only: /.*/
+
+      - upload_docs_wheels:
+          requires:
+             - remote_python_packaging
+             - build_doxygen
+          filters:
+            tags:
+              only: /.*/
+      # - rustfmt:
      #     requires:
-      #       - build_test_docs_wheel
-      #       - build_doxygen
-      - rustfmt:
-          requires:
-            - cargo_fetch
-      - clippy:
-          requires:
-           - cargo_fetch
+      #       - cargo_fetch
+      # - clippy:
+      #     requires:
+      #      - cargo_fetch

-      - build_doxygen
+      - build_doxygen:
+          filters:
+            tags:
+              only: /.*/

      # Linux Desktop 64bit
      # - test_x86_64-unknown-linux-gnu:
--- a/.github/workflows/code-quality.yml
+++ b/.github/workflows/code-quality.yml
@@ -0,0 +1,48 @@
+on: push
+name: Code Quality
+jobs:
+
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly-2019-11-06
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --workspace --examples --tests --all-features
+
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly-2019-11-06
+          override: true
+      - run: rustup component add rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+
+  run_clippy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+            toolchain: nightly-2019-11-06
+            components: clippy
+            override: true
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all-features
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,205 @@
 # Changelog 

+## 1.0.0-beta.24
+
+- fix oauth2/gmail bug introduced in beta23 (not used in releases) #1219
+
+- fix panic when receiving eg. cyrillic filenames #1216
+
+- delete all consumed secure-join handshake messagess #1209 #1212
+
+- rust-level cleanups #1218 #1217 #1210 #1205
+
+- python-level cleanups #1204 #1202 #1201
+
+
+## 1.0.0-beta.23
+
+- #1197 fix imap-deletion of messages 
+
+- #1171 Combine multiple MDNs into a single mail, reducing traffic 
+
+- #1155 fix to not send out gossip always, reducing traffic
+
+- #1160 fix reply-to-encrypted determination 
+
+- #1182 Add "Auto-Submitted: auto-replied" header to MDNs
+
+- #1194 produce python wheels again, fix c/py.delta.chat
+  master-deployment 
+
+- rust-level housekeeping and improvements #1161 #1186 #1185 #1190 #1194 #1199 #1191 #1190 #1184 and more
+
+- #1063 clarify licensing 
+
+- #1147 use mailparse 0.10.2 
+
+
+## 1.0.0-beta.22
+
+- #1095 normalize email lineends to CRLF
+
+- #1095 enable link-time-optimization, saves eg. on android 11 mb
+
+- #1099 fix import regarding devicechats
+
+- #1092 improve logging
+
+- #1096 #1097 #1094 #1090 #1091 internal cleanups
+
+## 1.0.0-beta.21
+
+- #1078 #1082 ensure RFC compliance by producing 78 column lines for
+  encoded attachments. 
+
+- #1080 don't recreate and thus break group membership if an unknown 
+  sender (or mailer-daemon) sends a message referencing the group chat 
+
+- #1081 #1079 some internal cleanups 
+
+- update imap-proto dependency, to fix yandex/oauth 
+
+## 1.0.0-beta.20
+
+- #1074 fix OAUTH2/gmail
+- #1072 fix group members not appearing in contact list
+- #1071 never block interrupt_idle (thus hopefully also not on maybe_network())
+- #1069 reduce smtp-timeout to 30 seconds
+- #1066 #1065 avoid unwrap in dehtml, make literals more readable
+
+## 1.0.0-beta.19
+
+- #1058 timeout smtp-send if it doesn't complete in 15 minutes 
+
+- #1059 trim down logging
+
+## 1.0.0-beta.18
+
+- #1056 avoid panicking when we couldn't read imap-server's greeting
+  message 
+
+- #1055 avoid panicking when we don't have a selected folder
+
+- #1052 #1049 #1051 improve logging to add thread-id/name and
+  file/lineno to each info/warn message.
+
+- #1050 allow python bindings to initialize Account with "os_name".
+
+
+## 1.0.0-beta.17
+
+- #1044 implement avatar recoding to 192x192 in core to keep file sizes small. 
+
+- #1024 fix #1021 SQL/injection malformed Chat-Group-Name breakage
+
+- #1036 fix smtp crash by pulling in a fixed async-smtp 
+
+- #1039 fix read-receipts appearing as normal messages when you change
+  MDN settings 
+
+- #1040 do not panic on SystemTimeDifference
+
+- #1043 avoid potential crashes in malformed From/Chat-Disposition... headers  
+
+- #1045 #1041 #1038 #1035 #1034 #1029 #1025 various cleanups and doc
+  improvments 
+
+## 1.0.0-beta.16
+
+- alleviate login problems with providers which only
+  support RSA1024 keys by switching back from Rustls 
+  to native-tls, by using the new async-email/async-native-tls 
+  crate from @dignifiedquire. thanks @link2xt. 
+
+- introduce per-contact profile images to send out 
+  own profile image heuristically, and fix sending
+  out of profile images in "in-prepare" groups. 
+  this also extends the Chat-spec that is maintained
+  in core to specify Chat-Group-Image and Chat-Group-Avatar
+  headers. thanks @r10s and @hpk42.
+
+- fix merging of protected headers from the encrypted
+  to the unencrypted parts, now not happening recursively
+  anymore.  thanks @hpk and @r10s
+
+- fix/optimize autocrypt gossip headers to only get 
+  sent when there are more than 2 people in a chat. 
+  thanks @link2xt
+
+- fix displayname to use the authenticated name 
+  when available (displayname as coming from contacts 
+  themselves). thanks @simon-laux
+
+- introduce preliminary support for offline autoconfig 
+  for nauta provider. thanks @hpk42 @r10s
+
+## 1.0.0-beta.15
+
+- fix #994 attachment appeared doubled in chats (and where actually
+  downloaded after smtp-send). @hpk42
+
+## 1.0.0-beta.14
+
+- fix packaging issue with our rust-email fork, now we are tracking
+  master again there. hpk42
+
+## 1.0.0-beta.13
+
+- fix #976 -- unicode-issues in display-name of email addresses. @hpk42
+
+- fix #985 group add/remove member bugs resulting in broken groups.  @hpk42
+
+- fix hanging IMAP connections -- we now detect with a 15second timeout
+  if we cannot terminate the IDLE IMAP protocol. @hpk42 @link2xt
+
+- fix incoming multipart/mixed containing html, to show up as
+  attachments again.  Fixes usage for simplebot which sends html
+  files for users to interact with the bot. @adbenitez @hpk42 
+
+- refinements to internal autocrypt-handling code, do not send
+  prefer-encrypt=nopreference as it is the default if no attribute
+  is present.  @linkxt 
+
+- simplify, modularize and rustify several parts 
+  of dc-core (general WIP). @link2xt @flub @hpk42 @r10s
+
+- use async-email/async-smtp to handle SMTP connections, might
+  fix connection/reconnection issues. @link2xt 
+
+- more tests and refinements for dealing with blobstorage @flub @hpk42 
+
+- use a dedicated build-server for CI testing of core PRs
+
+
+## 1.0.0-beta.12
+
+- fix python bindings to use core for copying attachments to blobdir
+  and fix core to actually do it. @hpk42
+
+## 1.0.0-beta.11
+
+- trigger reconnect more often on imap error states.  Should fix an 
+  issue observed when trying to empty a folder.  @hpk42
+
+- un-split qr tests: we fixed qr-securejoin protocol flakyness 
+  last weeks. @hpk42
+
+## 1.0.0-beta.10
+
+- fix grpid-determination from in-reply-to and references headers. @hpk42
+
+- only send Autocrypt-gossip headers on encrypted messages. @dignifiedquire
+
+- fix reply-to-encrypted message to also be encrypted. @hpk42
+
+- remove last unsafe code from dc_receive_imf :) @hpk42
+
+- add experimental new dc_chat_get_info_json FFI/API so that desktop devs
+  can play with using it. @jikstra
+
+- fix encoding of subjects and attachment-filenames @hpk42
+  @dignifiedquire . 
+
 ## 1.0.0-beta.9

 - historic: we now use the mailparse crate and lettre-email to generate mime
@@ -22,7 +222,9 @@
 - fix flakyness/sometimes-failing verified/join-protocols, 
  thanks @flub, @r10s, @hpk42

- new DC_EVENT_SECUREJOIN_SUCCEEDED event 
+- fix reply-to-encrypted message to keep encryption 
+
+- new DC_EVENT_SECUREJOIN_MEMBER_ADDED event 

 - many little fixes and rustifications (@link2xt, @flub, @hpk42)

--- a/Cargo.lock
+++ b/Cargo.lock
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,27 +1,31 @@
 [package]
 name = "deltachat"
-version = "1.0.0-beta.8"
+version = "1.0.0-beta.24"
 authors = ["Delta Chat Developers (ML) <delta@codespeak.net>"]
 edition = "2018"
-license = "MPL"
+license = "MPL-2.0"
+
+[profile.release]
+lto = true

 [dependencies]
 deltachat_derive = { path = "./deltachat_derive" }

 libc = "0.2.51"
-pgp = { git = "https://github.com/rpgp/rpgp", branch = "master", default-features = false }
+pgp = { version = "0.4.0", default-features = false }
 hex = "0.4.0"
 sha2 = "0.8.0"
-rand = "0.6.5"
-smallvec = "0.6.9"
-reqwest = { version = "0.9.15", default-features = false, features = ["rustls-tls"] }
-num-derive = "0.2.5"
+rand = "0.7.0"
+smallvec = "1.0.0"
+reqwest = { version = "0.10.0", features = ["blocking", "json"] }
+num-derive = "0.3.0"
 num-traits = "0.2.6"
-lettre = { git = "https://github.com/deltachat/lettre", branch = "feat/mail" }
-lettre_email = { git = "https://github.com/deltachat/lettre", branch = "feat/mail" }
-async-imap = { git = "https://github.com/async-email/async-imap", branch="master" }
-async-tls = "0.6"
-async-std = { version = "1.0", features = ["unstable"] }
+async-smtp = "0.2"
+email = { git = "https://github.com/deltachat/rust-email", branch = "master" }
+lettre_email = { git = "https://github.com/deltachat/lettre", branch = "master" }
+async-imap = "0.2"
+async-native-tls = "0.3.1"
+async-std = { version = "1.4", features = ["unstable"] }
 base64 = "0.11"
 charset = "0.1"
 percent-encoding = "2.0"
@@ -30,12 +34,11 @@ serde_json = "1.0"
 chrono = "0.4.6"
 failure = "0.1.5"
 failure_derive = "0.1.5"
-# TODO: make optional
-rustyline = "4.1.0"
+indexmap = "1.3.0"
 lazy_static = "1.4.0"
 regex = "1.1.6"
-rusqlite = { version = "0.20", features = ["bundled"] }
-r2d2_sqlite = "0.12.0"
+rusqlite = { version = "0.21", features = ["bundled"] }
+r2d2_sqlite = "0.13.0"
 r2d2 = "0.8.5"
 strum = "0.16.0"
 strum_macros = "0.16.0"
@@ -44,16 +47,19 @@ backtrace = "0.3.33"
 byteorder = "1.3.1"
 itertools = "0.8.0"
 image-meta = "0.1.0"
-quick-xml = "0.15.0"
+quick-xml = "0.17.1"
 escaper = "0.1.0"
 bitflags = "1.1.0"
 debug_stub_derive = "0.3.0"
 sanitize-filename = "0.2.1"
 stop-token = { version = "0.1.1", features = ["unstable"] }
-rustls = "0.16.0"
-webpki-roots = "0.18.0"
-webpki = "0.21.0"
-mailparse = "0.10.1"
+mailparse = { git = "https://github.com/link2xt/mailparse", branch="address-comma" }
+encoded-words = { git = "https://github.com/async-email/encoded-words", branch="master" }
+native-tls = "0.2.3"
+image = { version = "0.22.4", default-features=false, features = ["gif_codec", "jpeg", "ico", "png_codec", "pnm", "webp", "bmp"] }
+pretty_env_logger = "0.3.1"
+
+rustyline = { version = "4.1.0", optional = true }

 [dev-dependencies]
 tempfile = "3.0"
@@ -74,10 +80,11 @@ path = "examples/simple.rs"
 [[example]]
 name = "repl"
 path = "examples/repl/main.rs"
+required-features = ["rustyline"]


 [features]
 default = ["nightly", "ringbuf"]
-vendored = []
+vendored = ["async-native-tls/vendored", "reqwest/native-tls-vendored", "async-smtp/native-tls-vendored"]
 nightly = ["pgp/nightly"]
 ringbuf = ["pgp/ringbuf"]
--- a/3
+++ b/3
@@ -2,9 +2,6 @@ The files in this directory and under its subdirectories
 are (c) 2019 by Bjoern Petersen and contributors and released under the
 Mozilla Public License Version 2.0, see below for a copy.

-NOTE that the files in the "libs" directory are copyrighted by third parties
-and come with their own respective licenses.
-
 Mozilla Public License Version 2.0
 ==================================

--- a/README.md
+++ b/README.md
@@ -87,6 +87,15 @@ $ cargo test --all
 $ cargo build -p deltachat_ffi --release
 ```

+## Debugging environment variables 
+
+- `DCC_IMAP_DEBUG`: if set IMAP protocol commands and responses will be
+  printed
+
+- `DCC_MIME_DEBUG`: if set outgoing and incoming message will be printed 
+
+
+
 ### Expensive tests

 Some tests are expensive and marked with `#[ignore]`, to run these
@@ -105,3 +114,22 @@ $ cargo test -- --ignored
 [circle]: https://circleci.com/gh/deltachat/deltachat-core-rust/
 [appveyor-shield]: https://ci.appveyor.com/api/projects/status/lqpegel3ld4ipxj8/branch/master?style=flat-square
 [appveyor]: https://ci.appveyor.com/project/dignifiedquire/deltachat-core-rust/branch/master
+
+## Language bindings and frontend projects
+
+Language bindings are available for:
+
+- [C](https://c.delta.chat)
+- [Node.js](https://www.npmjs.com/package/deltachat-node)
+- [Python](https://py.delta.chat)
+- [Go](https://github.com/hugot/go-deltachat/)
+- **Java** and **Swift** (contained in the Android/iOS repos)
+
+The following "frontend" projects make use of the Rust-library
+or its language bindings:
+
+- [Android](https://github.com/deltachat/deltachat-android)
+- [iOS](https://github.com/deltachat/deltachat-ios)
+- [Desktop](https://github.com/deltachat/deltachat-desktop)
+- [Pidgin](https://code.ur.gs/lupine/purple-plugin-delta/)
+- several **Bots**
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -8,7 +8,6 @@ install:
  - set PATH=%PATH%;%USERPROFILE%\.cargo\bin
  - rustc -vV
  - cargo -vV
-  - cargo update

 build: false

--- a/assets/icon-device.png
+++ b/assets/icon-device.png
--- a/assets/icon-device.svg
+++ b/assets/icon-device.svg
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+       id="path4340"
+       inkscape:connector-curvature="0" />
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--- a/assets/icon-saved-messages.png
+++ b/assets/icon-saved-messages.png
--- a/assets/icon-saved-messages.svg
+++ b/assets/icon-saved-messages.svg
@@ -7,42 +7,42 @@
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   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   inkscape:version="0.92.4 5da689c313, 2019-01-14"
-   sodipodi:docname="icon-saved-messages.svg"
-   id="svg4344"
-   preserveAspectRatio="xMidYMid meet"
-   viewBox="0 0 45 45"
-   height="60"
-   width="60"
-   version="1.0"
-   inkscape:export-filename="/home/kerle/test-icon.png"
+   inkscape:export-ydpi="409.60001"
   inkscape:export-xdpi="409.60001"
-   inkscape:export-ydpi="409.60001">
+   inkscape:export-filename="/home/kerle/test-icon.png"
+   version="1.0"
+   width="60"
+   height="60"
+   viewBox="0 0 45 45"
+   preserveAspectRatio="xMidYMid meet"
+   id="svg4344"
+   sodipodi:docname="icon-saved-messages.svg"
+   inkscape:version="1.0beta1 (32d4812, 2019-09-19)">
  <defs
     id="defs4348" />
  <sodipodi:namedview
-     inkscape:lockguides="false"
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-     id="namedview4346"
-     inkscape:window-height="855"
-     inkscape:window-width="1395"
-     inkscape:pageshadow="2"
-     inkscape:pageopacity="0"
-     guidetolerance="10"
-     gridtolerance="10"
-     objecttolerance="10"
-     borderopacity="1"
-     inkscape:document-rotation="0"
+     pagecolor="#ffffff"
     bordercolor="#666666"
-     pagecolor="#ffffff" />
+     inkscape:document-rotation="0"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1395"
+     inkscape:window-height="855"
+     id="namedview4346"
+     showgrid="false"
+     units="px"
+     inkscape:zoom="4"
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+     inkscape:current-layer="svg4344"
+     inkscape:lockguides="false" />
  <metadata
     id="metadata4336">
 Created by potrace 1.15, written by Peter Selinger 2001-2017
@@ -56,21 +56,16 @@ Created by potrace 1.15, written by Peter Selinger 2001-2017
  </cc:Work>
 </rdf:RDF>
 </metadata>
-  <circle
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-     cx="22.5"
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+  <rect
+     y="0"
+     x="0"
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+     width="45"
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+     id="rect846"
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 </svg>
--- a/assets/welcome-image.jpg
+++ b/assets/welcome-image.jpg
--- a/ci_scripts/ci_upload.sh
+++ b/ci_scripts/ci_upload.sh
@@ -14,24 +14,22 @@ DOXYDOCDIR=${3:?directory where doxygen docs to be found}
 export BRANCH=${CIRCLE_BRANCH:?specify branch for uploading purposes}


-# DISABLED: python docs to py.delta.chat
-#ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null delta@py.delta.chat mkdir -p build/${BRANCH}
-#rsync -avz \
-#  -e "ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null" \
-#  "$PYDOCDIR/html/" \
-#  delta@py.delta.chat:build/${BRANCH}
+# python docs to py.delta.chat
+ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null delta@py.delta.chat mkdir -p build/${BRANCH}
+rsync -avz \
+  --delete \
+  -e "ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null" \
+  "$PYDOCDIR/html/" \
+  delta@py.delta.chat:build/${BRANCH}

 # C docs to c.delta.chat
 ssh -o BatchMode=yes -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null delta@c.delta.chat mkdir -p build-c/${BRANCH}
 rsync -avz \
+  --delete \
  -e "ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null" \
  "$DOXYDOCDIR/html/" \
  delta@c.delta.chat:build-c/${BRANCH}

-exit 0
-
-# OUTDATED -- for re-use from python release-scripts 
-
 echo -----------------------
 echo upload wheels 
 echo -----------------------
@@ -39,6 +37,7 @@ echo -----------------------
 # Bundle external shared libraries into the wheels
 pushd $WHEELHOUSEDIR

+pip3 install -U pip
 pip3 install devpi-client
 devpi use https://m.devpi.net
 devpi login dc --password $DEVPI_LOGIN
@@ -50,6 +49,9 @@ devpi use dc/$N_BRANCH || {
    devpi use dc/$N_BRANCH
 }
 devpi index $N_BRANCH bases=/root/pypi
-devpi upload deltachat*.whl
+devpi upload deltachat*

 popd
+
+# remove devpi non-master dc indices if thy are too old
+python ci_scripts/cleanup_devpi_indices.py
--- a/ci_scripts/cleanup_devpi_indices.py
+++ b/ci_scripts/cleanup_devpi_indices.py
@@ -0,0 +1,69 @@
+"""
+Remove old "dc" indices except for master which always stays.
+
+"""
+from requests import Session
+import datetime
+import sys
+import subprocess
+
+MAXDAYS=7
+
+session = Session()
+session.headers["Accept"] = "application/json"
+
+
+def get_indexes(baseurl, username):
+    response = session.get(baseurl + username)
+    assert response.status_code == 200
+    result = response.json()["result"]
+    return result["indexes"]
+
+
+def get_projectnames(baseurl, username, indexname):
+    response = session.get(baseurl + username + "/" + indexname)
+    assert response.status_code == 200
+    result = response.json()["result"]
+    return result["projects"]
+
+
+def get_release_dates(baseurl, username, indexname, projectname):
+    response = session.get(baseurl + username + "/" + indexname + "/" + projectname)
+    assert response.status_code == 200
+    result = response.json()["result"]
+    dates = set()
+    for value in result.values():
+        if "+links" not in value:
+            continue
+        for link in value["+links"]:
+            for log in link["log"]:
+                dates.add(tuple(log["when"]))
+    return dates
+
+
+def run():
+    baseurl = "https://m.devpi.net/"
+    username = "dc"
+    for indexname in get_indexes(baseurl, username):
+        projectnames = get_projectnames(baseurl, username, indexname)
+        if indexname == "master" or not indexname:
+            continue
+        assert projectnames == ["deltachat"]
+        for projectname in projectnames:
+            dates = get_release_dates(baseurl, username, indexname, projectname)
+            if not dates:
+                print(
+                    "%s has no releases" % (baseurl + username + "/" + indexname),
+                    file=sys.stderr)
+                date = datetime.datetime.now()
+            else:
+                date = datetime.datetime(*max(dates))
+            if (datetime.datetime.now() - date) > datetime.timedelta(days=MAXDAYS):
+                assert username and indexname
+                url = baseurl + username + "/" + indexname
+                subprocess.check_call(["devpi", "index", "-y", "--delete", url])
+
+
+
+if __name__ == '__main__':
+    run()
--- a/ci_scripts/docker-coredeps/Dockerfile
+++ b/ci_scripts/docker-coredeps/Dockerfile
@@ -5,14 +5,11 @@ RUN echo /usr/local/lib64 > /etc/ld.so.conf.d/local.conf && \
    echo /usr/local/lib >> /etc/ld.so.conf.d/local.conf
 ENV PKG_CONFIG_PATH /usr/local/lib64/pkgconfig:/usr/local/lib/pkgconfig

-# Install a recent Perl, needed to install OpenSSL
+# Install a recent Perl, needed to install the openssl crate 
 ADD deps/build_perl.sh /builder/build_perl.sh
+RUN rm /usr/bin/perl
 RUN mkdir tmp1 && cd tmp1 && bash /builder/build_perl.sh && cd .. && rm -r tmp1

-# Install OpenSSL
-ADD deps/build_openssl.sh /builder/build_openssl.sh
-RUN mkdir tmp1 && cd tmp1 && bash /builder/build_openssl.sh && cd .. && rm -r tmp1
-
 ENV PIP_DISABLE_PIP_VERSION_CHECK 1

 # Install python tools (auditwheels,tox, ...)
--- a/ci_scripts/docker-coredeps/deps/build_rust.sh
+++ b/ci_scripts/docker-coredeps/deps/build_rust.sh
@@ -3,6 +3,9 @@
 set -e -x

 # Install Rust
-curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain nightly-2019-09-12 -y
+curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain nightly-2019-11-06 -y
 export PATH=/root/.cargo/bin:$PATH
 rustc --version
+
+# remove some 300-400 MB that we don't need for automated builds
+rm -rf /root/.rustup/toolchains/nightly-2019-11-06-x86_64-unknown-linux-gnu/share/
--- a/ci_scripts/docker-coredeps/deps/run_all.sh
+++ b/ci_scripts/docker-coredeps/deps/run_all.sh
@@ -1,49 +0,0 @@
-#!/bin/bash
-#
-# Build the Delta Chat C/Rust library
-#
-set -e -x
-
-# perform clean build of core and install 
-export TOXWORKDIR=.docker-tox
-
-# build core library
-
-cargo build --release -p deltachat_ffi
-
-# configure access to a base python and 
-# to several python interpreters needed by tox below
-export PATH=$PATH:/opt/python/cp35-cp35m/bin
-export PYTHONDONTWRITEBYTECODE=1
-pushd /bin
-ln -s /opt/python/cp27-cp27m/bin/python2.7
-ln -s /opt/python/cp36-cp36m/bin/python3.6
-ln -s /opt/python/cp37-cp37m/bin/python3.7
-popd
-
-#
-# run python tests
-#
-
-if [ -n "$TESTS" ]; then 
-
-    echo ----------------
-    echo run python tests
-    echo ----------------
-
-    pushd python 
-    # first run all tests ...
-    rm -rf tests/__pycache__
-    rm -rf src/deltachat/__pycache__
-    export PYTHONDONTWRITEBYTECODE=1
-    tox --workdir "$TOXWORKDIR" -e py27,py35,py36,py37
-    popd
-fi
-
-
-if [ -n "$DOCS" ]; then 
-    echo -----------------------
-    echo generating python docs
-    echo -----------------------
-    (cd python && tox --workdir "$TOXWORKDIR" -e doc) 
-fi
--- a/ci_scripts/remote_python_packaging.sh
+++ b/ci_scripts/remote_python_packaging.sh
@@ -0,0 +1,51 @@
+#!/bin/bash 
+
+export BRANCH=${CIRCLE_BRANCH:?branch to build}
+export REPONAME=${CIRCLE_PROJECT_REPONAME:?repository name}
+export SSHTARGET=${SSHTARGET-ci@b1.delta.chat}
+
+# we construct the BUILDDIR such that we can easily share the
+# CARGO_TARGET_DIR between runs ("..")
+export BUILDDIR=ci_builds/$REPONAME/$BRANCH/${CIRCLE_JOB:?jobname}/${CIRCLE_BUILD_NUM:?circle-build-number}
+
+echo "--- Copying files to $SSHTARGET:$BUILDDIR"
+
+set -xe
+
+ssh -oBatchMode=yes -oStrictHostKeyChecking=no  $SSHTARGET mkdir -p "$BUILDDIR"
+git ls-files >.rsynclist 
+# we seem to need .git for setuptools_scm versioning 
+find .git >>.rsynclist
+rsync --delete --files-from=.rsynclist -az ./ "$SSHTARGET:$BUILDDIR"
+
+set +x
+
+# we have to create a remote file for the remote-docker run 
+# so we can do a simple ssh command with a TTY
+# so that when our job dies, all container-runs are aborted.
+# sidenote: the circle-ci machinery will kill ongoing jobs
+# if there are new commits and we want to ensure that 
+# everything is terminated/cleaned up and we have no orphaned
+# useless still-running docker-containers consuming resources. 
+
+ssh $SSHTARGET bash -c "cat >$BUILDDIR/exec_docker_run" <<_HERE
+    set +x -e
+    cd $BUILDDIR
+    export DCC_PY_LIVECONFIG=$DCC_PY_LIVECONFIG
+
+    set -x
+
+    # run everything else inside docker 
+    docker run -e DCC_PY_LIVECONFIG \
+       --rm -it -v \$(pwd):/mnt -w /mnt \
+       deltachat/coredeps ci_scripts/run_all.sh
+
+_HERE
+
+echo "--- Running $CIRCLE_JOB remotely"
+
+ssh -t $SSHTARGET bash "$BUILDDIR/exec_docker_run"
+mkdir -p workspace 
+rsync -avz "$SSHTARGET:$BUILDDIR/python/.docker-tox/wheelhouse/*manylinux1*" workspace/wheelhouse/
+rsync -avz "$SSHTARGET:$BUILDDIR/python/.docker-tox/dist/*" workspace/wheelhouse/
+rsync -avz "$SSHTARGET:$BUILDDIR/python/doc/_build/" workspace/py-docs
--- a/ci_scripts/remote_tests_python.sh
+++ b/ci_scripts/remote_tests_python.sh
@@ -2,7 +2,7 @@

 export BRANCH=${CIRCLE_BRANCH:?branch to build}
 export REPONAME=${CIRCLE_PROJECT_REPONAME:?repository name}
-export SSHTARGET=ci@b1.delta.chat
+export SSHTARGET=${SSHTARGET-ci@b1.delta.chat}

 # we construct the BUILDDIR such that we can easily share the
 # CARGO_TARGET_DIR between runs ("..")
--- a/ci_scripts/remote_tests_rust.sh
+++ b/ci_scripts/remote_tests_rust.sh
@@ -2,7 +2,7 @@

 export BRANCH=${CIRCLE_BRANCH:?branch to build}
 export REPONAME=${CIRCLE_PROJECT_REPONAME:?repository name}
-export SSHTARGET=ci@b1.delta.chat
+export SSHTARGET=${SSHTARGET-ci@b1.delta.chat}

 # we construct the BUILDDIR such that we can easily share the
 # CARGO_TARGET_DIR between runs ("..")
--- a/ci_scripts/run-doxygen.sh
+++ b/ci_scripts/run-doxygen.sh
@@ -3,5 +3,4 @@
 set -ex

 cd deltachat-ffi 
-doxygen 
-
+PROJECT_NUMBER=$(git log -1 --format "%h (%cd)") doxygen 
--- a/ci_scripts/run-python-test.sh
+++ b/ci_scripts/run-python-test.sh
@@ -6,7 +6,7 @@
 set -e -x

 # for core-building and python install step
-export DCC_RS_TARGET=release
+export DCC_RS_TARGET=debug
 export DCC_RS_DEV=`pwd`

 cd python
--- a/ci_scripts/run_all.sh
+++ b/ci_scripts/run_all.sh
@@ -0,0 +1,48 @@
+#!/bin/bash
+#
+# Build the Delta Chat Core Rust library, Python wheels and docs 
+
+set -e -x
+
+# Perform clean build of core and install.
+export TOXWORKDIR=.docker-tox
+
+# compile core lib
+
+export PATH=/root/.cargo/bin:$PATH
+cargo build --release -p deltachat_ffi
+# cargo test --all --all-features
+
+# Statically link against libdeltachat.a.
+export DCC_RS_DEV=$(pwd)
+
+# Configure access to a base python and to several python interpreters
+# needed by tox below.
+export PATH=$PATH:/opt/python/cp35-cp35m/bin
+export PYTHONDONTWRITEBYTECODE=1
+pushd /bin
+ln -s /opt/python/cp27-cp27m/bin/python2.7
+ln -s /opt/python/cp36-cp36m/bin/python3.6
+ln -s /opt/python/cp37-cp37m/bin/python3.7
+ln -s /opt/python/cp38-cp38/bin/python3.8
+popd
+
+pushd python
+# prepare a clean tox run
+rm -rf tests/__pycache__
+rm -rf src/deltachat/__pycache__
+mkdir -p $TOXWORKDIR
+
+# disable live-account testing to speed up test runs and wheel building
+# XXX we may switch on some live-tests on for better ensurances 
+# Note that the independent remote_tests_python step does all kinds of
+# live-testing already. 
+unset DCC_PY_LIVECONFIG 
+tox --workdir "$TOXWORKDIR" -e py35,py36,py37,py38,auditwheels
+popd
+
+
+echo -----------------------
+echo generating python docs
+echo -----------------------
+(cd python && tox --workdir "$TOXWORKDIR" -e doc)
--- a/deltachat-ffi/Cargo.toml
+++ b/deltachat-ffi/Cargo.toml
@@ -1,11 +1,11 @@
 [package]
 name = "deltachat_ffi"
-version = "1.0.0-beta.8"
+version = "1.0.0-beta.24"
 description = "Deltachat FFI"
 authors = ["Delta Chat Developers (ML) <delta@codespeak.net>"]
 edition = "2018"
 readme = "README.md"
-license = "MIT OR Apache-2.0"
+license = "MPL-2.0"

 keywords = ["deltachat", "chat", "openpgp", "email", "encryption"]
 categories = ["cryptography", "std", "email"]
@@ -16,11 +16,11 @@ crate-type = ["cdylib", "staticlib"]

 [dependencies]
 deltachat = { path = "../", default-features = false }
-deltachat-provider-database = "0.2.1"
 libc = "0.2"
 human-panic = "1.0.1"
 num-traits = "0.2.6"
 failure = "0.1.6"
+serde_json = "1.0"

 [features]
 default = ["vendored", "nightly", "ringbuf"]
--- a/deltachat-ffi/deltachat.h
+++ b/deltachat-ffi/deltachat.h
@@ -403,20 +403,37 @@ int             dc_set_config                (dc_context_t* context, const char*
 */
 char*           dc_get_config                (dc_context_t* context, const char* key);

+
 /**
- * Set stock string translation. 
+ * Set stock string translation.
 *
- * The function will emit warnings if it returns an error state. 
+ * The function will emit warnings if it returns an error state.
 *
 * @memberof dc_context_t
 * @param context The context object
 * @param stock_id   the integer id of the stock message (DC_STR_*)
- * @param stock_msg  the message to be used 
+ * @param stock_msg  the message to be used
 * @return int (==0 on error, 1 on success)
 */
 int             dc_set_stock_translation(dc_context_t* context, uint32_t stock_id, const char* stock_msg);


+/**
+ * Set configuration values from a QR code containing an account.
+ * Before this function is called, dc_check_qr() should confirm the type of the
+ * QR code is DC_QR_ACCOUNT.
+ *
+ * Internally, the function will call dc_set_config()
+ * at least with the keys `addr` and `mail_pw`.
+ *
+ * @memberof dc_context_t
+ * @param context The context object
+ * @param qr scanned QR code
+ * @return int (==0 on error, 1 on success)
+ */
+int             dc_set_config_from_qr   (dc_context_t* context, const char* qr);
+
+
 /**
 * Get information about the context.
 *
@@ -852,6 +869,27 @@ void            dc_interrupt_smtp_idle       (dc_context_t* context);
 void            dc_maybe_network             (dc_context_t* context);


+/**
+ * Save a keypair as the default keys for the user.
+ *
+ * This API is only for testing purposes and should not be used as part of a
+ * normal application, use the import-export APIs instead.
+ *
+ * This saves a public/private keypair as the default keypair in the context.
+ * It allows avoiding having to generate a secret key for unittests which need
+ * one.
+ *
+ * @memberof dc_context_t
+ * @param context The context as created by dc_context_new().
+ * @param addr The email address of the user.  This must match the
+ *    configured_addr setting of the context as well as the UID of the key.
+ * @param public_data The public key as base64.
+ * @param secret_data The secret key as base64.
+ * @return 1 on success, 0 on failure.
+ */
+int             dc_preconfigure_keypair        (dc_context_t* context, const char *addr, const char *public_data, const char *secret_data);
+
+
 // handle chatlists

 #define         DC_GCL_ARCHIVED_ONLY         0x01
@@ -994,11 +1032,20 @@ uint32_t        dc_get_chat_id_by_contact_id (dc_context_t* context, uint32_t co
 *
 * Example:
 * ~~~
+ * char* blobdir = dc_get_blobdir(context);
+ * char* file_to_send = mprintf("%s/%s", blobdir, "send.mp4")
+ *
 * dc_msg_t* msg = dc_msg_new(context, DC_MSG_VIDEO);
- * dc_msg_set_file(msg, "/file/to/send.mp4", NULL);
+ * dc_msg_set_file(msg, file_to_send, NULL);
 * dc_prepare_msg(context, chat_id, msg);
- * // ... after /file/to/send.mp4 is ready:
+ *
+ * // ... create the file ...
+ *
 * dc_send_msg(context, chat_id, msg);
+ *
+ * dc_msg_unref(msg);
+ * free(file_to_send);
+ * dc_str_unref(file_to_send);
 * ~~~
 *
 * @memberof dc_context_t
@@ -1024,8 +1071,11 @@ uint32_t        dc_prepare_msg               (dc_context_t* context, uint32_t ch
 * Example:
 * ~~~
 * dc_msg_t* msg = dc_msg_new(context, DC_MSG_IMAGE);
+ *
 * dc_msg_set_file(msg, "/file/to/send.jpg", NULL);
 * dc_send_msg(context, chat_id, msg);
+ *
+ * dc_msg_unref(msg);
 * ~~~
 *
 * @memberof dc_context_t
@@ -1134,6 +1184,9 @@ void            dc_set_draft                 (dc_context_t* context, uint32_t ch
 *     // add a changelog
 *     dc_add_device_msg(context, "update-123", changelog_msg);
 * }
+ *
+ * dc_msg_unref(changelog_msg);
+ * dc_msg_unref(welome_msg);
 * ~~~
 */
 uint32_t        dc_add_device_msg            (dc_context_t* context, const char* label, dc_msg_t* msg);
@@ -1541,6 +1594,22 @@ int             dc_set_chat_name             (dc_context_t* context, uint32_t ch
 int             dc_set_chat_profile_image    (dc_context_t* context, uint32_t chat_id, const char* image);


+
+/**
+ * Set mute duration of a chat.
+ *
+ * This value can be checked by the ui upon receiving a new message to decide whether it should trigger an notification.
+ *
+ * Sends out #DC_EVENT_CHAT_MODIFIED.
+ *
+ * @memberof dc_context_t
+ * @param chat_id The chat ID to set the mute duration.
+ * @param duration The duration (0 for no mute, -1 for forever mute, everything else is is the relative mute duration from now in seconds)
+ * @param context The context as created by dc_context_new().
+ * @return 1=success, 0=error
+ */
+int             dc_set_chat_mute_duration             (dc_context_t* context, uint32_t chat_id, int64_t duration);
+
 // handle messages

 /**
@@ -1588,7 +1657,7 @@ char*           dc_get_mime_headers          (dc_context_t* context, uint32_t ms
 void            dc_delete_msgs               (dc_context_t* context, const uint32_t* msg_ids, int msg_cnt);

 /**
- * Empty IMAP server folder: delete all messages. 
+ * Empty IMAP server folder: delete all messages.
 *
 * @memberof dc_context_t
 * @param context The context object as created by dc_context_new()
@@ -1741,7 +1810,7 @@ uint32_t        dc_create_contact            (dc_context_t* context, const char*
 * Trying to add email-addresses that are already in the contact list,
 * results in updating the name unless the name was changed manually by the user.
 * If any email-address or any name is really updated,
- * the event DC_EVENT_CONTACTS_CHANGED is sent.
+ * the event #DC_EVENT_CONTACTS_CHANGED is sent.
 *
 * To add a single contact entered by the user, you should prefer dc_create_contact(),
 * however, for adding a bunch of addresses, this function is _much_ faster.
@@ -1947,7 +2016,7 @@ void            dc_imex                      (dc_context_t* context, int what, c
 *         }
 *         while (!configure_succeeded())
 *     }
- *     free(file);
+ *     dc_str_unref(file);
 * }
 * ~~~
 *
@@ -2059,6 +2128,7 @@ void            dc_stop_ongoing_process      (dc_context_t* context);
 #define         DC_QR_FPR_OK                 210 // id=contact
 #define         DC_QR_FPR_MISMATCH           220 // id=contact
 #define         DC_QR_FPR_WITHOUT_ADDR       230 // test1=formatted fingerprint
+#define         DC_QR_ACCOUNT                250 // text1=domain
 #define         DC_QR_ADDR                   320 // id=contact
 #define         DC_QR_TEXT                   330 // text1=text
 #define         DC_QR_URL                    332 // text1=URL
@@ -2076,12 +2146,12 @@ void            dc_stop_ongoing_process      (dc_context_t* context);
 * - DC_QR_FPR_OK with dc_lot_t::id=Contact ID
 * - DC_QR_FPR_MISMATCH with dc_lot_t::id=Contact ID
 * - DC_QR_FPR_WITHOUT_ADDR with dc_lot_t::test1=Formatted fingerprint
+ * - DC_QR_ACCOUNT allows creation of an account, dc_lot_t::text1=domain
 * - DC_QR_ADDR with dc_lot_t::id=Contact ID
 * - DC_QR_TEXT with dc_lot_t::text1=Text
 * - DC_QR_URL with dc_lot_t::text1=URL
 * - DC_QR_ERROR with dc_lot_t::text1=Error string
 *
- *
 * @memberof dc_context_t
 * @param context The context object.
 * @param qr The text of the scanned QR code.
@@ -2092,20 +2162,22 @@ dc_lot_t*       dc_check_qr                  (dc_context_t* context, const char*


 /**
- * Get QR code text that will offer an secure-join verification.
+ * Get QR code text that will offer an Setup-Contact or Verified-Group invitation.
 * The QR code is compatible to the OPENPGP4FPR format
 * so that a basic fingerprint comparison also works eg. with OpenKeychain.
 *
 * The scanning device will pass the scanned content to dc_check_qr() then;
- * if this function returns DC_QR_ASK_VERIFYCONTACT or DC_QR_ASK_VERIFYGROUP
+ * if dc_check_qr() returns DC_QR_ASK_VERIFYCONTACT or DC_QR_ASK_VERIFYGROUP
 * an out-of-band-verification can be joined using dc_join_securejoin()
 *
 * @memberof dc_context_t
 * @param context The context object.
 * @param chat_id If set to a group-chat-id,
- *     the group-join-protocol is offered in the QR code;
+ *     the Verified-Group-Invite protocol is offered in the QR code;
 *     works for verified groups as well as for normal groups.
- *     If set to 0, the setup-Verified-contact-protocol is offered in the QR code.
+ *     If set to 0, the Setup-Contact protocol is offered in the QR code.
+ *     See https://countermitm.readthedocs.io/en/latest/new.html
+ *     for details about both protocols.
 * @return Text that should go to the QR code,
 *     On errors, an empty QR code is returned, NULL is never returned.
 *     The returned string must be released using dc_str_unref() after usage.
@@ -2114,13 +2186,29 @@ char*           dc_get_securejoin_qr         (dc_context_t* context, uint32_t ch


 /**
- * Join an out-of-band-verification initiated on another device with dc_get_securejoin_qr().
+ * Continue a Setup-Contact or Verified-Group-Invite protocol
+ * started on another device with dc_get_securejoin_qr().
 * This function is typically called when dc_check_qr() returns
 * lot.state=DC_QR_ASK_VERIFYCONTACT or lot.state=DC_QR_ASK_VERIFYGROUP.
 *
- * This function takes some time and sends and receives several messages.
- * You should call it in a separate thread; if you want to abort it, you should
- * call dc_stop_ongoing_process().
+ * Depending on the given QR code,
+ * this function may takes some time and sends and receives several messages.
+ * Therefore, you should call it always in a separate thread;
+ * if you want to abort it, you should call dc_stop_ongoing_process().
+ *
+ * - If the given QR code starts the Setup-Contact protocol,
+ *   the function typically returns immediately
+ *   and the handshake runs in background.
+ *   Subsequent calls of dc_join_securejoin() will abort unfinished tasks.
+ *   The returned chat is the one-to-one opportunistic chat.
+ *   When the protocol has finished, an info-message is added to that chat.
+ * - If the given QR code starts the Verified-Group-Invite protocol,
+ *   the function waits until the protocol has finished.
+ *   This is because the verified group is not opportunistic
+ *   and can be created only when the contacts have verified each other.
+ *
+ * See https://countermitm.readthedocs.io/en/latest/new.html
+ * for details about both protocols.
 *
 * @memberof dc_context_t
 * @param context The context object
@@ -2128,6 +2216,9 @@ char*           dc_get_securejoin_qr         (dc_context_t* context, uint32_t ch
 *     to dc_check_qr().
 * @return Chat-id of the joined chat, the UI may redirect to the this chat.
 *     If the out-of-band verification failed or was aborted, 0 is returned.
+ *     A returned chat-id does not guarantee that the chat or the belonging contact is verified.
+ *     If needed, this be checked with dc_chat_is_verified() and dc_contact_is_verified(),
+ *     however, in practise, the UI will just listen to #DC_EVENT_CONTACTS_CHANGED unconditionally.
 */
 uint32_t        dc_join_securejoin           (dc_context_t* context, const char* qr);

@@ -2602,6 +2693,25 @@ dc_lot_t*        dc_chatlist_get_summary     (const dc_chatlist_t* chatlist, siz
 dc_context_t*    dc_chatlist_get_context     (dc_chatlist_t* chatlist);


+/**
+ * Get info summary for a chat, in json format.
+ *
+ * The returned json string has the following key/values:
+ *
+ * id: chat id
+ * name: chat/group name
+ * color: color of this chat
+ * last-message-from: who sent the last message
+ * last-message-text: message (truncated)
+ * last-message-state: DC_STATE* constant
+ * last-message-date:
+ * avatar-path: path-to-blobfile
+ * is_verified: yes/no
+
+ * @return a utf8-encoded json string containing all requested info. Must be freed using dc_str_unref().  NULL is never returned.
+ */
+char*            dc_chat_get_info_json       (dc_context_t* context, size_t chat_id);
+
 /**
 * @class dc_chat_t
 *
@@ -2843,6 +2953,26 @@ int             dc_chat_is_verified          (const dc_chat_t* chat);
 int             dc_chat_is_sending_locations (const dc_chat_t* chat);


+/**
+ * Check whether the chat is currently muted
+ *
+ * @memberof dc_chat_t
+ * @param chat The chat object.
+ * @return 1=muted, 0=not muted
+ */
+int             dc_chat_is_muted (const dc_chat_t* chat);
+
+
+/**
+ * Get the exact state of the mute of a chat
+ *
+ * @memberof dc_chat_t
+ * @param chat The chat object.
+ * @return 0=not muted, -1=forever muted, (x>0)=remaining seconds until the mute is lifted
+ */
+int64_t          dc_chat_get_remaining_mute_duration (const dc_chat_t* chat);
+
+
 /**
 * @class dc_msg_t
 *
@@ -2955,15 +3085,15 @@ int             dc_msg_get_viewtype           (const dc_msg_t* msg);
 * Get the state of a message.
 *
 * Incoming message states:
- * - DC_STATE_IN_FRESH (10) - Incoming _fresh_ message. Fresh messages are not noticed nor seen and are typically shown in notifications. Use dc_get_fresh_msgs() to get all fresh messages.
- * - DC_STATE_IN_NOTICED (13) - Incoming _noticed_ message. Eg. chat opened but message not yet read - noticed messages are not counted as unread but did not marked as read nor resulted in MDNs. Use dc_marknoticed_chat() or dc_marknoticed_contact() to mark messages as being noticed.
- * - DC_STATE_IN_SEEN (16) - Incoming message, really _seen_ by the user. Marked as read on IMAP and MDN may be send. Use dc_markseen_msgs() to mark messages as being seen.
+ * - DC_STATE_IN_FRESH (10) - Incoming _fresh_ message. Fresh messages are neither noticed nor seen and are typically shown in notifications. Use dc_get_fresh_msgs() to get all fresh messages.
+ * - DC_STATE_IN_NOTICED (13) - Incoming _noticed_ message. E.g. chat opened but message not yet read - noticed messages are not counted as unread but did not marked as read nor resulted in MDNs. Use dc_marknoticed_chat() or dc_marknoticed_contact() to mark messages as being noticed.
+ * - DC_STATE_IN_SEEN (16) - Incoming message, really _seen_ by the user. Marked as read on IMAP and MDN may be sent. Use dc_markseen_msgs() to mark messages as being seen.
 *
 * Outgoing message states:
 * - DC_STATE_OUT_PREPARING (18) - For files which need time to be prepared before they can be sent,
 *   the message enters this state before DC_STATE_OUT_PENDING.
 * - DC_STATE_OUT_DRAFT (19) - Message saved as draft using dc_set_draft()
- * - DC_STATE_OUT_PENDING (20) - The user has send the "send" button but the
+ * - DC_STATE_OUT_PENDING (20) - The user has pressed the "send" button but the
 *   message is not yet sent and is pending in some way. Maybe we're offline (no checkmark).
 * - DC_STATE_OUT_FAILED (24) - _Unrecoverable_ error (_recoverable_ errors result in pending messages), you'll receive the event #DC_EVENT_MSG_FAILED.
 * - DC_STATE_OUT_DELIVERED (26) - Outgoing message successfully delivered to server (one checkmark). Note, that already delivered messages may get into the state DC_STATE_OUT_FAILED if we get such a hint from the server.
@@ -3611,11 +3741,15 @@ int             dc_contact_is_blocked        (const dc_contact_t* contact);


 /**
- * Same as dc_contact_is_verified() but allows speeding up things
- * by adding the peerstate belonging to the contact.
- * If you do not have the peerstate available, it is loaded automatically.
+ * Check if a contact was verified. E.g. by a secure-join QR code scan
+ * and if the key has not changed since this verification.
 *
- * @private @memberof dc_context_t
+ * The UI may draw a checkbox or something like that beside verified contacts.
+ *
+ * @memberof dc_contact_t
+ * @param contact The contact object.
+ * @return 0: contact is not verified.
+ *    2: SELF and contact have verified their fingerprints in both directions; in the UI typically checkmarks are shown.
 */
 int             dc_contact_is_verified       (dc_contact_t* contact);

@@ -3627,30 +3761,19 @@ int             dc_contact_is_verified       (dc_contact_t* contact);
 */


-/**
- * Create a provider struct for the given domain.
- *
- * @memberof dc_provider_t
- * @param domain The domain to get provider info for.
- * @return a dc_provider_t struct which can be used with the dc_provider_get_*
- *     accessor functions.  If no provider info is found, NULL will be
- *     returned.
- */
-dc_provider_t*  dc_provider_new_from_domain           (const char* domain);
-
-
 /**
 * Create a provider struct for the given email address.
 *
 * The provider is extracted from the email address and it's information is returned.
 *
 * @memberof dc_provider_t
+ * @param context The context object as created by dc_context_new().
 * @param email The user's email address to extract the provider info form.
 * @return a dc_provider_t struct which can be used with the dc_provider_get_*
 *     accessor functions.  If no provider info is found, NULL will be
 *     returned.
 */
-dc_provider_t*  dc_provider_new_from_email            (const char* email);
+dc_provider_t*  dc_provider_new_from_email            (const dc_context_t*, const char* email);


 /**
@@ -3660,53 +3783,35 @@ dc_provider_t*  dc_provider_new_from_email            (const char* email);
 *
 * @memberof dc_provider_t
 * @param provider The dc_provider_t struct.
- * @return A string which must be released using dc_str_unref().
+ * @return String with a fully-qualified URL,
+ *     if there is no such URL, an empty string is returned, NULL is never returned.
+ *     The returned value must be released using dc_str_unref().
 */
 char*           dc_provider_get_overview_page         (const dc_provider_t* provider);


 /**
- * The provider's name.
+ * Get hints to be shown to the user on the login screen.
+ * Depending on the @ref DC_PROVIDER_STATUS returned by dc_provider_get_status(),
+ * the ui may want to highlight the hint.
 *
- * The name of the provider, e.g. "POSTEO".
+ * Moreover, the ui should display a "More information" link
+ * that forwards to the url returned by dc_provider_get_overview_page().
 *
 * @memberof dc_provider_t
 * @param provider The dc_provider_t struct.
- * @return A string which must be released using dc_str_unref().
+ * @return A string with the hint to show to the user, may contain multiple lines,
+ *     if there is no such hint, an empty string is returned, NULL is never returned.
+ *     The returned value must be released using dc_str_unref().
 */
-char*           dc_provider_get_name                  (const dc_provider_t* provider);
-
-
-/**
- * The markdown content of the providers page.
- *
- * This contains the preparation steps or additional information if the status
- * is @ref DC_PROVIDER_STATUS_BROKEN.
- *
- * @memberof dc_provider_t
- * @param provider The dc_provider_t struct.
- * @return A string which must be released using dc_str_unref().
- */
-char*           dc_provider_get_markdown              (const dc_provider_t* provider);
-
-
-/**
- * Date of when the state was last checked/updated.
- *
- * This is returned as a string.
- *
- * @memberof dc_provider_t
- * @param provider The dc_provider_t struct.
- * @return A string which must be released using dc_str_unref().
- */
-char*           dc_provider_get_status_date           (const dc_provider_t* provider);
+char*           dc_provider_get_before_login_hint     (const dc_provider_t* provider);


 /**
 * Whether DC works with this provider.
 *
- * Can be one of @ref DC_PROVIDER_STATUS_OK, @ref
- * DC_PROVIDER_STATUS_PREPARATION and @ref DC_PROVIDER_STATUS_BROKEN.
+ * Can be one of #DC_PROVIDER_STATUS_OK,
+ * #DC_PROVIDER_STATUS_PREPARATION or #DC_PROVIDER_STATUS_BROKEN.
 *
 * @memberof dc_provider_t
 * @param provider The dc_provider_t struct.
@@ -3721,7 +3826,7 @@ int             dc_provider_get_status                (const dc_provider_t* prov
 * @memberof dc_provider_t
 * @param provider The dc_provider_t struct.
 */
-void            dc_provider_unref                     (const dc_provider_t* provider);
+void            dc_provider_unref                     (dc_provider_t* provider);


 /**
@@ -4016,11 +4121,6 @@ int64_t          dc_lot_get_timestamp     (const dc_lot_t* lot);
 */
 #define DC_CERTCK_STRICT 1

-/**
- * Accept invalid hostnames, but not invalid certificates.
- */
-#define DC_CERTCK_ACCEPT_INVALID_HOSTNAMES 2
-
 /**
 * Accept invalid certificates, including self-signed ones
 * or having incorrect hostname.
@@ -4134,30 +4234,30 @@ int64_t          dc_lot_get_timestamp     (const dc_lot_t* lot);
 #define DC_EVENT_IMAP_MESSAGE_MOVED   105

 /**
- * Emitted when an IMAP folder was emptied. 
+ * Emitted when an IMAP folder was emptied.
 *
 * @param data1 0
- * @param data2 (const char*) folder name. 
+ * @param data2 (const char*) folder name.
 *     Must not be unref'd or modified and is valid only until the callback returns.
 * @return 0
 */
 #define DC_EVENT_IMAP_FOLDER_EMPTIED  106

 /**
- * Emitted when a new blob file was successfully written 
+ * Emitted when a new blob file was successfully written
 *
 * @param data1 0
- * @param data2 (const char*) path name 
+ * @param data2 (const char*) path name
 *     Must not be unref'd or modified and is valid only until the callback returns.
 * @return 0
 */
 #define DC_EVENT_NEW_BLOB_FILE 150

 /**
- * Emitted when a blob file was successfully deleted 
+ * Emitted when a blob file was successfully deleted
 *
 * @param data1 0
- * @param data2 (const char*) path name 
+ * @param data2 (const char*) path name
 *     Must not be unref'd or modified and is valid only until the callback returns.
 * @return 0
 */
@@ -4314,7 +4414,7 @@ int64_t          dc_lot_get_timestamp     (const dc_lot_t* lot);


 /**
- * Contact(s) created, renamed, blocked or deleted.
+ * Contact(s) created, renamed, verified, blocked or deleted.
 *
 * @param data1 (int) If not 0, this is the contact_id of an added contact that should be selected.
 * @param data2 0
@@ -4452,23 +4552,43 @@ void            dc_array_add_id              (dc_array_t*, uint32_t); // depreca
 */

 /**
- * Provider status returned by dc_provider_get_status().
+ * Prover works out-of-the-box.
+ * This provider status is returned for provider where the login
+ * works by just entering the name or the email-address.
 *
- * Works right out of the box without any preperation steps needed
+ * - There is no need for the user to do any special things
+ *   (enable IMAP or so) in the provider's webinterface or at other places.
+ * - There is no need for the user to enter advanced settings;
+ *   server, port etc. are known by the core.
+ *
+ * The status is returned by dc_provider_get_status().
 */
 #define         DC_PROVIDER_STATUS_OK           1

 /**
- * Provider status returned by dc_provider_get_status().
+ * Provider works, but there are preparations needed.
 *
- * Works, but preparation steps are needed
+ * - The user has to do some special things as "Enable IMAP in the Webinterface",
+ *   what exactly, is described in the string returnd by dc_provider_get_before_login_hints()
+ *   and, typically more detailed, in the page linked by dc_provider_get_overview_page().
+ * - There is no need for the user to enter advanced settings;
+ *   server, port etc. should be known by the core.
+ *
+ * The status is returned by dc_provider_get_status().
 */
 #define         DC_PROVIDER_STATUS_PREPARATION  2

 /**
- * Provider status returned by dc_provider_get_status().
+ * Provider is not working.
+ * This provider status is returned for providers
+ * that are known to not work with Delta Chat.
+ * The ui should block logging in with this provider.
 *
- * Doesn't work (too unstable to use falls also in this category)
+ * More information about that is typically provided
+ * in the string returned by dc_provider_get_before_login_hints()
+ * and in the page linked by dc_provider_get_overview_page().
+ *
+ * The status is returned by dc_provider_get_status().
 */
 #define         DC_PROVIDER_STATUS_BROKEN       3

--- a/deltachat-ffi/src/dc_array.rs
+++ b/deltachat-ffi/src/dc_array.rs
@@ -2,7 +2,6 @@ use crate::location::Location;

 /* * the structure behind dc_array_t */
 #[derive(Debug, Clone)]
-#[allow(non_camel_case_types)]
 pub enum dc_array_t {
    Locations(Vec<Location>),
    Uint(Vec<u32>),
--- a/deltachat-ffi/src/lib.rs
+++ b/deltachat-ffi/src/lib.rs
@@ -4,12 +4,14 @@
    non_upper_case_globals,
    non_upper_case_globals,
    non_camel_case_types,
-    non_snake_case
+    clippy::missing_safety_doc,
+    clippy::expect_fun_call
 )]

 #[macro_use]
 extern crate human_panic;
 extern crate num_traits;
+extern crate serde_json;

 use std::collections::HashMap;
 use std::convert::TryInto;
@@ -18,17 +20,23 @@ use std::fmt::Write;
 use std::ptr;
 use std::str::FromStr;
 use std::sync::RwLock;
+use std::time::{Duration, SystemTime};

 use libc::uintptr_t;
 use num_traits::{FromPrimitive, ToPrimitive};

+use deltachat::chat::ChatId;
+use deltachat::chat::MuteDuration;
 use deltachat::constants::DC_MSG_ID_LAST_SPECIAL;
 use deltachat::contact::Contact;
 use deltachat::context::Context;
+use deltachat::key::DcKey;
 use deltachat::message::MsgId;
 use deltachat::stock::StockMessage;
 use deltachat::*;

+mod dc_array;
+
 mod string;
 use self::string::*;

@@ -89,6 +97,14 @@ impl ContextWrapper {
        self.translate_cb(Event::Error(msg.to_string()));
    }

+    /// Log a warning on the FFI context.
+    ///
+    /// Like [error] but logs as a warning which only goes to the
+    /// logfile rather than being shown directly to the user.
+    unsafe fn warning(&self, msg: &str) {
+        self.translate_cb(Event::Warning(msg.to_string()));
+    }
+
    /// Unlock the context and execute a closure with it.
    ///
    /// This unlocks the context and gets a read lock.  The Rust
@@ -104,89 +120,110 @@ impl ContextWrapper {
    /// the appropriate return value for an error return since this
    /// differs for various functions on the FFI API: sometimes 0,
    /// NULL, an empty string etc.
-    fn with_inner<T, F>(&self, ctxfn: F) -> Result<T, ()>
+    ///
+    /// Prefer to use [ContextWrapper::try_inner], we might want to
+    /// remove this function at some point to reduce the cognitive
+    /// overload of having two functions which are too similar.
+    unsafe fn with_inner<T, F>(&self, ctxfn: F) -> Result<T, ()>
    where
        F: FnOnce(&Context) -> T,
+    {
+        self.try_inner(|ctx| Ok(ctxfn(ctx))).map_err(|err| {
+            self.warning(&err.to_string());
+        })
+    }
+
+    /// Unlock the context and execute a closure with it.
+    ///
+    /// This is like [ContextWrapper::with_inner] but uses
+    /// [failure::Error] as error type.  This allows you to write a
+    /// closure which could produce many errors, use the `?` operator
+    /// to return them and handle them all as the return of this call.
+    fn try_inner<T, F>(&self, ctxfn: F) -> Result<T, failure::Error>
+    where
+        F: FnOnce(&Context) -> Result<T, failure::Error>,
    {
        let guard = self.inner.read().unwrap();
        match guard.as_ref() {
-            Some(ref ctx) => Ok(ctxfn(ctx)),
-            None => {
-                unsafe { self.error("context not open") };
-                Err(())
-            }
+            Some(ref ctx) => ctxfn(ctx),
+            None => Err(failure::err_msg("context not open")),
        }
    }

    /// Translates the callback from the rust style to the C-style version.
-    unsafe fn translate_cb(&self, event: Event) -> uintptr_t {
-        match self.cb {
-            Some(ffi_cb) => {
-                let event_id = event.as_id();
-                match event {
-                    Event::Info(msg)
-                    | Event::SmtpConnected(msg)
-                    | Event::ImapConnected(msg)
-                    | Event::SmtpMessageSent(msg)
-                    | Event::ImapMessageDeleted(msg)
-                    | Event::ImapMessageMoved(msg)
-                    | Event::ImapFolderEmptied(msg)
-                    | Event::NewBlobFile(msg)
-                    | Event::DeletedBlobFile(msg)
-                    | Event::Warning(msg)
-                    | Event::Error(msg)
-                    | Event::ErrorNetwork(msg)
-                    | Event::ErrorSelfNotInGroup(msg) => {
-                        let data2 = CString::new(msg).unwrap_or_default();
-                        ffi_cb(self, event_id, 0, data2.as_ptr() as uintptr_t)
-                    }
-                    Event::MsgsChanged { chat_id, msg_id }
-                    | Event::IncomingMsg { chat_id, msg_id }
-                    | Event::MsgDelivered { chat_id, msg_id }
-                    | Event::MsgFailed { chat_id, msg_id }
-                    | Event::MsgRead { chat_id, msg_id } => ffi_cb(
+    unsafe fn translate_cb(&self, event: Event) {
+        if let Some(ffi_cb) = self.cb {
+            let event_id = event.as_id();
+            match event {
+                Event::Info(msg)
+                | Event::SmtpConnected(msg)
+                | Event::ImapConnected(msg)
+                | Event::SmtpMessageSent(msg)
+                | Event::ImapMessageDeleted(msg)
+                | Event::ImapMessageMoved(msg)
+                | Event::ImapFolderEmptied(msg)
+                | Event::NewBlobFile(msg)
+                | Event::DeletedBlobFile(msg)
+                | Event::Warning(msg)
+                | Event::Error(msg)
+                | Event::ErrorNetwork(msg)
+                | Event::ErrorSelfNotInGroup(msg) => {
+                    let data2 = CString::new(msg).unwrap_or_default();
+                    ffi_cb(self, event_id, 0, data2.as_ptr() as uintptr_t);
+                }
+                Event::MsgsChanged { chat_id, msg_id }
+                | Event::IncomingMsg { chat_id, msg_id }
+                | Event::MsgDelivered { chat_id, msg_id }
+                | Event::MsgFailed { chat_id, msg_id }
+                | Event::MsgRead { chat_id, msg_id } => {
+                    ffi_cb(
                        self,
                        event_id,
-                        chat_id as uintptr_t,
+                        chat_id.to_u32() as uintptr_t,
                        msg_id.to_u32() as uintptr_t,
-                    ),
-                    Event::ChatModified(chat_id) => ffi_cb(self, event_id, chat_id as uintptr_t, 0),
-                    Event::ContactsChanged(id) | Event::LocationChanged(id) => {
-                        let id = id.unwrap_or_default();
-                        ffi_cb(self, event_id, id as uintptr_t, 0)
-                    }
-                    Event::ConfigureProgress(progress) | Event::ImexProgress(progress) => {
-                        ffi_cb(self, event_id, progress as uintptr_t, 0)
-                    }
-                    Event::ImexFileWritten(file) => {
-                        let data1 = file.to_c_string().unwrap_or_default();
-                        ffi_cb(self, event_id, data1.as_ptr() as uintptr_t, 0)
-                    }
-                    Event::SecurejoinInviterProgress {
-                        contact_id,
-                        progress,
-                    }
-                    | Event::SecurejoinJoinerProgress {
-                        contact_id,
-                        progress,
-                    } => ffi_cb(
+                    );
+                }
+                Event::ChatModified(chat_id) => {
+                    ffi_cb(self, event_id, chat_id.to_u32() as uintptr_t, 0);
+                }
+                Event::ContactsChanged(id) | Event::LocationChanged(id) => {
+                    let id = id.unwrap_or_default();
+                    ffi_cb(self, event_id, id as uintptr_t, 0);
+                }
+                Event::ConfigureProgress(progress) | Event::ImexProgress(progress) => {
+                    ffi_cb(self, event_id, progress as uintptr_t, 0);
+                }
+                Event::ImexFileWritten(file) => {
+                    let data1 = file.to_c_string().unwrap_or_default();
+                    ffi_cb(self, event_id, data1.as_ptr() as uintptr_t, 0);
+                }
+                Event::SecurejoinInviterProgress {
+                    contact_id,
+                    progress,
+                }
+                | Event::SecurejoinJoinerProgress {
+                    contact_id,
+                    progress,
+                } => {
+                    ffi_cb(
                        self,
                        event_id,
                        contact_id as uintptr_t,
                        progress as uintptr_t,
-                    ),
-                    Event::SecurejoinMemberAdded {
-                        chat_id,
-                        contact_id,
-                    } => ffi_cb(
+                    );
+                }
+                Event::SecurejoinMemberAdded {
+                    chat_id,
+                    contact_id,
+                } => {
+                    ffi_cb(
                        self,
                        event_id,
-                        chat_id as uintptr_t,
+                        chat_id.to_u32() as uintptr_t,
                        contact_id as uintptr_t,
-                    ),
+                    );
                }
            }
-            None => 0,
        }
    }
 }
@@ -386,6 +423,28 @@ pub unsafe extern "C" fn dc_set_stock_translation(
        .unwrap_or(0)
 }

+#[no_mangle]
+pub unsafe extern "C" fn dc_set_config_from_qr(
+    context: *mut dc_context_t,
+    qr: *mut libc::c_char,
+) -> libc::c_int {
+    if context.is_null() || qr.is_null() {
+        eprintln!("ignoring careless call to dc_set_config_from_qr");
+        return 0;
+    }
+    let qr = to_string_lossy(qr);
+    let ffi_context = &*context;
+    ffi_context
+        .with_inner(|ctx| match qr::set_config_from_qr(ctx, &qr) {
+            Ok(()) => 1,
+            Err(err) => {
+                error!(ctx, "Failed to create account from QR code: {}", err);
+                0
+            }
+        })
+        .unwrap_or(0)
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn dc_get_info(context: *mut dc_context_t) -> *mut libc::c_char {
    if context.is_null() {
@@ -406,7 +465,7 @@ fn render_info(
 ) -> std::result::Result<String, std::fmt::Error> {
    let mut res = String::new();
    for (key, value) in &info {
-        write!(&mut res, "{}={}\n", key, value)?;
+        writeln!(&mut res, "{}={}", key, value)?;
    }

    Ok(res)
@@ -507,7 +566,7 @@ pub unsafe extern "C" fn dc_interrupt_imap_idle(context: *mut dc_context_t) {
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| job::interrupt_inbox_idle(ctx, true))
+        .with_inner(|ctx| job::interrupt_inbox_idle(ctx))
        .unwrap_or(())
 }

@@ -655,6 +714,35 @@ pub unsafe extern "C" fn dc_maybe_network(context: *mut dc_context_t) {
        .unwrap_or(())
 }

+#[no_mangle]
+pub unsafe extern "C" fn dc_preconfigure_keypair(
+    context: *mut dc_context_t,
+    addr: *const libc::c_char,
+    public_data: *const libc::c_char,
+    secret_data: *const libc::c_char,
+) -> i32 {
+    if context.is_null() {
+        eprintln!("ignoring careless call to dc_preconfigure_keypair()");
+        return 0;
+    }
+    let ffi_context = &*context;
+    ffi_context
+        .try_inner(|ctx| {
+            let addr = dc_tools::EmailAddress::new(&to_string_lossy(addr))?;
+            let public = key::SignedPublicKey::from_base64(&to_string_lossy(public_data))?;
+            let secret = key::SignedSecretKey::from_base64(&to_string_lossy(secret_data))?;
+            let keypair = key::KeyPair {
+                addr,
+                public,
+                secret,
+            };
+            key::store_self_keypair(ctx, &keypair, key::KeyPairUse::Default)?;
+            Ok(1)
+        })
+        .log_warn(ffi_context, "Failed to save keypair")
+        .unwrap_or(0)
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn dc_get_chatlist(
    context: *mut dc_context_t,
@@ -698,7 +786,9 @@ pub unsafe extern "C" fn dc_create_chat_by_msg_id(context: *mut dc_context_t, ms
    ffi_context
        .with_inner(|ctx| {
            chat::create_by_msg_id(ctx, MsgId::new(msg_id))
-                .unwrap_or_log_default(ctx, "Failed to create chat")
+                .log_err(ctx, "Failed to create chat from msg_id")
+                .map(|id| id.to_u32())
+                .unwrap_or(0)
        })
        .unwrap_or(0)
 }
@@ -716,7 +806,9 @@ pub unsafe extern "C" fn dc_create_chat_by_contact_id(
    ffi_context
        .with_inner(|ctx| {
            chat::create_by_contact_id(ctx, contact_id)
-                .unwrap_or_log_default(ctx, "Failed to create chat")
+                .log_err(ctx, "Failed to create chat from contact_id")
+                .map(|id| id.to_u32())
+                .unwrap_or(0)
        })
        .unwrap_or(0)
 }
@@ -732,7 +824,12 @@ pub unsafe extern "C" fn dc_get_chat_id_by_contact_id(
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| chat::get_by_contact_id(ctx, contact_id).unwrap_or(0))
+        .with_inner(|ctx| {
+            chat::get_by_contact_id(ctx, contact_id)
+                .log_err(ctx, "Failed to get chat for contact_id")
+                .map(|id| id.to_u32())
+                .unwrap_or(0)
+        })
        .unwrap_or(0)
 }

@@ -750,7 +847,7 @@ pub unsafe extern "C" fn dc_prepare_msg(
    let ffi_msg: &mut MessageWrapper = &mut *msg;
    ffi_context
        .with_inner(|ctx| {
-            chat::prepare_msg(ctx, chat_id, &mut ffi_msg.message)
+            chat::prepare_msg(ctx, ChatId::new(chat_id), &mut ffi_msg.message)
                .unwrap_or_log_default(ctx, "Failed to prepare message")
        })
        .map(|msg_id| msg_id.to_u32())
@@ -771,7 +868,7 @@ pub unsafe extern "C" fn dc_send_msg(
    let ffi_msg = &mut *msg;
    ffi_context
        .with_inner(|ctx| {
-            chat::send_msg(ctx, chat_id, &mut ffi_msg.message)
+            chat::send_msg(ctx, ChatId::new(chat_id), &mut ffi_msg.message)
                .unwrap_or_log_default(ctx, "Failed to send message")
        })
        .map(|msg_id| msg_id.to_u32())
@@ -792,7 +889,7 @@ pub unsafe extern "C" fn dc_send_text_msg(
    let text_to_send = to_string_lossy(text_to_send);
    ffi_context
        .with_inner(|ctx| {
-            chat::send_text_msg(ctx, chat_id, text_to_send)
+            chat::send_text_msg(ctx, ChatId::new(chat_id), text_to_send)
                .map(|msg_id| msg_id.to_u32())
                .unwrap_or_log_default(ctx, "Failed to send text message")
        })
@@ -817,7 +914,7 @@ pub unsafe extern "C" fn dc_set_draft(
        Some(&mut ffi_msg.message)
    };
    ffi_context
-        .with_inner(|ctx| chat::set_draft(ctx, chat_id, msg))
+        .with_inner(|ctx| ChatId::new(chat_id).set_draft(ctx, msg))
        .unwrap_or(())
 }

@@ -892,7 +989,7 @@ pub unsafe extern "C" fn dc_get_draft(context: *mut dc_context_t, chat_id: u32)
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| match chat::get_draft(ctx, chat_id) {
+        .with_inner(|ctx| match ChatId::new(chat_id).get_draft(ctx) {
            Ok(Some(draft)) => {
                let ffi_msg = MessageWrapper {
                    context,
@@ -929,7 +1026,7 @@ pub unsafe extern "C" fn dc_get_chat_msgs(
    ffi_context
        .with_inner(|ctx| {
            let arr = dc_array_t::from(
-                chat::get_chat_msgs(ctx, chat_id, flags, marker_flag)
+                chat::get_chat_msgs(ctx, ChatId::new(chat_id), flags, marker_flag)
                    .iter()
                    .map(|msg_id| msg_id.to_u32())
                    .collect::<Vec<u32>>(),
@@ -947,7 +1044,7 @@ pub unsafe extern "C" fn dc_get_msg_cnt(context: *mut dc_context_t, chat_id: u32
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| chat::get_msg_cnt(ctx, chat_id) as libc::c_int)
+        .with_inner(|ctx| ChatId::new(chat_id).get_msg_cnt(ctx) as libc::c_int)
        .unwrap_or(0)
 }

@@ -962,7 +1059,7 @@ pub unsafe extern "C" fn dc_get_fresh_msg_cnt(
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| chat::get_fresh_msg_cnt(ctx, chat_id) as libc::c_int)
+        .with_inner(|ctx| ChatId::new(chat_id).get_fresh_msg_cnt(ctx) as libc::c_int)
        .unwrap_or(0)
 }

@@ -997,7 +1094,9 @@ pub unsafe extern "C" fn dc_marknoticed_chat(context: *mut dc_context_t, chat_id
    let ffi_context = &*context;
    ffi_context
        .with_inner(|ctx| {
-            chat::marknoticed_chat(ctx, chat_id).log_err(ctx, "Failed marknoticed chat")
+            chat::marknoticed_chat(ctx, ChatId::new(chat_id))
+                .log_err(ctx, "Failed marknoticed chat")
+                .unwrap_or(())
        })
        .unwrap_or(())
 }
@@ -1011,7 +1110,9 @@ pub unsafe extern "C" fn dc_marknoticed_all_chats(context: *mut dc_context_t) {
    let ffi_context = &*context;
    ffi_context
        .with_inner(|ctx| {
-            chat::marknoticed_all_chats(ctx).log_err(ctx, "Failed marknoticed all chats")
+            chat::marknoticed_all_chats(ctx)
+                .log_err(ctx, "Failed marknoticed all chats")
+                .unwrap_or(())
        })
        .unwrap_or(())
 }
@@ -1045,10 +1146,16 @@ pub unsafe extern "C" fn dc_get_chat_media(
    ffi_context
        .with_inner(|ctx| {
            let arr = dc_array_t::from(
-                chat::get_chat_media(ctx, chat_id, msg_type, or_msg_type2, or_msg_type3)
-                    .iter()
-                    .map(|msg_id| msg_id.to_u32())
-                    .collect::<Vec<u32>>(),
+                chat::get_chat_media(
+                    ctx,
+                    ChatId::new(chat_id),
+                    msg_type,
+                    or_msg_type2,
+                    or_msg_type3,
+                )
+                .iter()
+                .map(|msg_id| msg_id.to_u32())
+                .collect::<Vec<u32>>(),
            );
            Box::into_raw(Box::new(arr))
        })
@@ -1115,7 +1222,12 @@ pub unsafe extern "C" fn dc_archive_chat(
        return;
    };
    ffi_context
-        .with_inner(|ctx| chat::archive(ctx, chat_id, archive).log_err(ctx, "Failed archive chat"))
+        .with_inner(|ctx| {
+            ChatId::new(chat_id)
+                .set_archived(ctx, archive)
+                .log_err(ctx, "Failed archive chat")
+                .unwrap_or(())
+        })
        .unwrap_or(())
 }

@@ -1127,7 +1239,12 @@ pub unsafe extern "C" fn dc_delete_chat(context: *mut dc_context_t, chat_id: u32
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| chat::delete(ctx, chat_id).log_err(ctx, "Failed chat delete"))
+        .with_inner(|ctx| {
+            ChatId::new(chat_id)
+                .delete(ctx)
+                .log_err(ctx, "Failed chat delete")
+                .unwrap_or(())
+        })
        .unwrap_or(())
 }

@@ -1143,7 +1260,7 @@ pub unsafe extern "C" fn dc_get_chat_contacts(
    let ffi_context = &*context;
    ffi_context
        .with_inner(|ctx| {
-            let arr = dc_array_t::from(chat::get_chat_contacts(ctx, chat_id));
+            let arr = dc_array_t::from(chat::get_chat_contacts(ctx, ChatId::new(chat_id)));
            Box::into_raw(Box::new(arr))
        })
        .unwrap_or_else(|_| ptr::null_mut())
@@ -1163,7 +1280,7 @@ pub unsafe extern "C" fn dc_search_msgs(
    ffi_context
        .with_inner(|ctx| {
            let arr = dc_array_t::from(
-                ctx.search_msgs(chat_id, to_string_lossy(query))
+                ctx.search_msgs(ChatId::new(chat_id), to_string_lossy(query))
                    .iter()
                    .map(|msg_id| msg_id.to_u32())
                    .collect::<Vec<u32>>(),
@@ -1181,13 +1298,15 @@ pub unsafe extern "C" fn dc_get_chat(context: *mut dc_context_t, chat_id: u32) -
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| match chat::Chat::load_from_db(ctx, chat_id) {
-            Ok(chat) => {
-                let ffi_chat = ChatWrapper { context, chat };
-                Box::into_raw(Box::new(ffi_chat))
-            }
-            Err(_) => ptr::null_mut(),
-        })
+        .with_inner(
+            |ctx| match chat::Chat::load_from_db(ctx, ChatId::new(chat_id)) {
+                Ok(chat) => {
+                    let ffi_chat = ChatWrapper { context, chat };
+                    Box::into_raw(Box::new(ffi_chat))
+                }
+                Err(_) => ptr::null_mut(),
+            },
+        )
        .unwrap_or_else(|_| ptr::null_mut())
 }

@@ -1210,7 +1329,9 @@ pub unsafe extern "C" fn dc_create_group_chat(
    ffi_context
        .with_inner(|ctx| {
            chat::create_group_chat(ctx, verified, to_string_lossy(name))
-                .unwrap_or_log_default(ctx, "Failed to create group chat")
+                .log_err(ctx, "Failed to create group chat")
+                .map(|id| id.to_u32())
+                .unwrap_or(0)
        })
        .unwrap_or(0)
 }
@@ -1227,7 +1348,7 @@ pub unsafe extern "C" fn dc_is_contact_in_chat(
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| chat::is_contact_in_chat(ctx, chat_id, contact_id))
+        .with_inner(|ctx| chat::is_contact_in_chat(ctx, ChatId::new(chat_id), contact_id))
        .unwrap_or_default()
        .into()
 }
@@ -1244,7 +1365,9 @@ pub unsafe extern "C" fn dc_add_contact_to_chat(
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| chat::add_contact_to_chat(ctx, chat_id, contact_id) as libc::c_int)
+        .with_inner(|ctx| {
+            chat::add_contact_to_chat(ctx, ChatId::new(chat_id), contact_id) as libc::c_int
+        })
        .unwrap_or(0)
 }

@@ -1261,7 +1384,7 @@ pub unsafe extern "C" fn dc_remove_contact_from_chat(
    let ffi_context = &*context;
    ffi_context
        .with_inner(|ctx| {
-            chat::remove_contact_from_chat(ctx, chat_id, contact_id)
+            chat::remove_contact_from_chat(ctx, ChatId::new(chat_id), contact_id)
                .map(|_| 1)
                .unwrap_or_log_default(ctx, "Failed to remove contact")
        })
@@ -1281,7 +1404,7 @@ pub unsafe extern "C" fn dc_set_chat_name(
    let ffi_context = &*context;
    ffi_context
        .with_inner(|ctx| {
-            chat::set_chat_name(ctx, chat_id, to_string_lossy(name))
+            chat::set_chat_name(ctx, ChatId::new(chat_id), to_string_lossy(name))
                .map(|_| 1)
                .unwrap_or_log_default(ctx, "Failed to set chat name")
        })
@@ -1301,13 +1424,44 @@ pub unsafe extern "C" fn dc_set_chat_profile_image(
    let ffi_context = &*context;
    ffi_context
        .with_inner(|ctx| {
-            chat::set_chat_profile_image(ctx, chat_id, to_string_lossy(image))
+            chat::set_chat_profile_image(ctx, ChatId::new(chat_id), to_string_lossy(image))
                .map(|_| 1)
                .unwrap_or_log_default(ctx, "Failed to set profile image")
        })
        .unwrap_or(0)
 }

+#[no_mangle]
+pub unsafe extern "C" fn dc_set_chat_mute_duration(
+    context: *mut dc_context_t,
+    chat_id: u32,
+    duration: i64,
+) -> libc::c_int {
+    if context.is_null() {
+        eprintln!("ignoring careless call to dc_set_chat_mute_duration()");
+        return 0;
+    }
+    let ffi_context = &*context;
+    let muteDuration = match duration {
+        0 => MuteDuration::NotMuted,
+        -1 => MuteDuration::Forever,
+        n if n > 0 => MuteDuration::Until(SystemTime::now() + Duration::from_secs(duration as u64)),
+        _ => {
+            ffi_context.warning(
+                "dc_chat_set_mute_duration(): Can not use negative duration other than -1",
+            );
+            return 0;
+        }
+    };
+    ffi_context
+        .with_inner(|ctx| {
+            chat::set_muted(ctx, ChatId::new(chat_id), muteDuration)
+                .map(|_| 1)
+                .unwrap_or_log_default(ctx, "Failed to set mute duration")
+        })
+        .unwrap_or(0)
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn dc_get_msg_info(
    context: *mut dc_context_t,
@@ -1337,7 +1491,7 @@ pub unsafe extern "C" fn dc_get_mime_headers(
        .with_inner(|ctx| {
            message::get_mime_headers(ctx, MsgId::new(msg_id))
                .map(|s| s.strdup())
-                .unwrap_or_else(|| ptr::null_mut())
+                .unwrap_or_else(ptr::null_mut)
        })
        .unwrap_or_else(|_| ptr::null_mut())
 }
@@ -1390,7 +1544,7 @@ pub unsafe extern "C" fn dc_forward_msgs(
    let ffi_context = &*context;
    ffi_context
        .with_inner(|ctx| {
-            chat::forward_msgs(ctx, &msg_ids[..], chat_id)
+            chat::forward_msgs(ctx, &msg_ids[..], ChatId::new(chat_id))
                .unwrap_or_log_default(ctx, "Failed to forward message")
        })
        .unwrap_or_default()
@@ -1710,7 +1864,9 @@ pub unsafe extern "C" fn dc_imex_has_backup(
        .with_inner(|ctx| match imex::has_backup(ctx, to_string_lossy(dir)) {
            Ok(res) => res.strdup(),
            Err(err) => {
-                error!(ctx, "dc_imex_has_backup: {}", err);
+                // do not bubble up error to the user,
+                // the ui will expect that the file does not exist or cannot be accessed
+                warn!(ctx, "dc_imex_has_backup: {}", err);
                ptr::null_mut()
            }
        })
@@ -1803,8 +1959,8 @@ pub unsafe extern "C" fn dc_get_securejoin_qr(
    let ffi_context = &*context;
    ffi_context
        .with_inner(|ctx| {
-            securejoin::dc_get_securejoin_qr(ctx, chat_id)
-                .unwrap_or("".to_string())
+            securejoin::dc_get_securejoin_qr(ctx, ChatId::new(chat_id))
+                .unwrap_or_else(|| "".to_string())
                .strdup()
        })
        .unwrap_or_else(|_| "".strdup())
@@ -1821,7 +1977,7 @@ pub unsafe extern "C" fn dc_join_securejoin(
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| securejoin::dc_join_securejoin(ctx, &to_string_lossy(qr)))
+        .with_inner(|ctx| securejoin::dc_join_securejoin(ctx, &to_string_lossy(qr)).to_u32())
        .unwrap_or(0)
 }

@@ -1837,7 +1993,9 @@ pub unsafe extern "C" fn dc_send_locations_to_chat(
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| location::send_locations_to_chat(ctx, chat_id, seconds as i64))
+        .with_inner(|ctx| {
+            location::send_locations_to_chat(ctx, ChatId::new(chat_id), seconds as i64)
+        })
        .ok();
 }

@@ -1852,7 +2010,9 @@ pub unsafe extern "C" fn dc_is_sending_locations_to_chat(
    }
    let ffi_context = &*context;
    ffi_context
-        .with_inner(|ctx| location::is_sending_locations_to_chat(ctx, chat_id) as libc::c_int)
+        .with_inner(|ctx| {
+            location::is_sending_locations_to_chat(ctx, ChatId::new(chat_id)) as libc::c_int
+        })
        .unwrap_or(0)
 }

@@ -1890,7 +2050,7 @@ pub unsafe extern "C" fn dc_get_locations(
        .with_inner(|ctx| {
            let res = location::get_range(
                ctx,
-                chat_id,
+                ChatId::new(chat_id),
                contact_id,
                timestamp_begin as i64,
                timestamp_end as i64,
@@ -2012,8 +2172,7 @@ pub unsafe extern "C" fn dc_array_get_chat_id(
        eprintln!("ignoring careless call to dc_array_get_chat_id()");
        return 0;
    }
-
-    (*array).get_location(index).chat_id
+    (*array).get_location(index).chat_id.to_u32()
 }
 #[no_mangle]
 pub unsafe extern "C" fn dc_array_get_contact_id(
@@ -2150,7 +2309,7 @@ pub unsafe extern "C" fn dc_chatlist_get_chat_id(
        return 0;
    }
    let ffi_list = &*chatlist;
-    ffi_list.list.get_chat_id(index as usize)
+    ffi_list.list.get_chat_id(index as usize).to_u32()
 }

 #[no_mangle]
@@ -2242,7 +2401,7 @@ pub unsafe extern "C" fn dc_chat_get_id(chat: *mut dc_chat_t) -> u32 {
        return 0;
    }
    let ffi_chat = &*chat;
-    ffi_chat.chat.get_id()
+    ffi_chat.chat.get_id().to_u32()
 }

 #[no_mangle]
@@ -2377,6 +2536,73 @@ pub unsafe extern "C" fn dc_chat_is_sending_locations(chat: *mut dc_chat_t) -> l
    ffi_chat.chat.is_sending_locations() as libc::c_int
 }

+#[no_mangle]
+pub unsafe extern "C" fn dc_chat_is_muted(chat: *mut dc_chat_t) -> libc::c_int {
+    if chat.is_null() {
+        eprintln!("ignoring careless call to dc_chat_is_muted()");
+        return 0;
+    }
+    let ffi_chat = &*chat;
+    ffi_chat.chat.is_muted() as libc::c_int
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn dc_chat_get_remaining_mute_duration(chat: *mut dc_chat_t) -> i64 {
+    if chat.is_null() {
+        eprintln!("ignoring careless call to dc_chat_get_remaining_mute_duration()");
+        return 0;
+    }
+    let ffi_chat = &*chat;
+    if !ffi_chat.chat.is_muted() {
+        return 0;
+    }
+    // If the chat was muted to before the epoch, it is not muted.
+    match ffi_chat.chat.mute_duration {
+        MuteDuration::NotMuted => 0,
+        MuteDuration::Forever => -1,
+        MuteDuration::Until(when) => when
+            .duration_since(SystemTime::UNIX_EPOCH)
+            .map(|d| d.as_secs() as i64)
+            .unwrap_or(0),
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn dc_chat_get_info_json(
+    context: *mut dc_context_t,
+    chat_id: u32,
+) -> *mut libc::c_char {
+    if context.is_null() {
+        eprintln!("ignoring careless call to dc_chat_get_info_json()");
+        return "".strdup();
+    }
+    let ffi_context = &*context;
+    ffi_context
+        .with_inner(|ctx| {
+            let chat = match chat::Chat::load_from_db(ctx, ChatId::new(chat_id)) {
+                Ok(chat) => chat,
+                Err(err) => {
+                    error!(ctx, "dc_get_chat_info_json() failed to load chat: {}", err);
+                    return "".strdup();
+                }
+            };
+            let info = match chat.get_info(ctx) {
+                Ok(info) => info,
+                Err(err) => {
+                    error!(
+                        ctx,
+                        "dc_get_chat_info_json() failed to get chat info: {}", err
+                    );
+                    return "".strdup();
+                }
+            };
+            serde_json::to_string(&info)
+                .unwrap_or_log_default(ctx, "dc_get_chat_info_json() failed to serialise to json")
+                .strdup()
+        })
+        .unwrap_or_else(|_| "".strdup())
+}
+
 // dc_msg_t

 /// FFI struct for [dc_msg_t]
@@ -2449,7 +2675,7 @@ pub unsafe extern "C" fn dc_msg_get_chat_id(msg: *mut dc_msg_t) -> u32 {
        return 0;
    }
    let ffi_msg = &*msg;
-    ffi_msg.message.get_chat_id()
+    ffi_msg.message.get_chat_id().to_u32()
 }

 #[no_mangle]
@@ -2556,7 +2782,7 @@ pub unsafe extern "C" fn dc_msg_get_filemime(msg: *mut dc_msg_t) -> *mut libc::c
    if let Some(x) = ffi_msg.message.get_filemime() {
        x.strdup()
    } else {
-        return dc_strdup(ptr::null());
+        dc_strdup(ptr::null())
    }
 }

@@ -2948,7 +3174,7 @@ pub unsafe extern "C" fn dc_contact_get_profile_image(
                .contact
                .get_profile_image(ctx)
                .map(|p| p.to_string_lossy().strdup())
-                .unwrap_or_else(|| std::ptr::null_mut())
+                .unwrap_or_else(std::ptr::null_mut)
        })
        .unwrap_or_else(|_| ptr::null_mut())
 }
@@ -3072,14 +3298,24 @@ pub unsafe extern "C" fn dc_str_unref(s: *mut libc::c_char) {
    libc::free(s as *mut _)
 }

-pub mod providers;
-
-pub trait ResultExt<T> {
+pub trait ResultExt<T, E> {
    fn unwrap_or_log_default(self, context: &context::Context, message: &str) -> T;
-    fn log_err(&self, context: &context::Context, message: &str);
+    fn log_err(self, context: &context::Context, message: &str) -> Result<T, E>;
+
+    /// Log a warning to a [ContextWrapper] for an [Err] result.
+    ///
+    /// Does nothing for an [Ok].  This is usually preferable over
+    /// [ResultExt::log_err] because warnings go to the logfile and
+    /// errors are displayed directly to the user.  Usually problems
+    /// on the FFI layer are coding errors and not errors which need
+    /// to be displayed to the user.
+    ///
+    /// You can do this as soon as the wrapper exists, it does not
+    /// have to be open (which is required for the `warn!()` macro).
+    fn log_warn(self, wrapper: &ContextWrapper, message: &str) -> Result<T, E>;
 }

-impl<T: Default, E: std::fmt::Display> ResultExt<T> for Result<T, E> {
+impl<T: Default, E: std::fmt::Display> ResultExt<T, E> for Result<T, E> {
    fn unwrap_or_log_default(self, context: &context::Context, message: &str) -> T {
        match self {
            Ok(t) => t,
@@ -3090,10 +3326,20 @@ impl<T: Default, E: std::fmt::Display> ResultExt<T> for Result<T, E> {
        }
    }

-    fn log_err(&self, context: &context::Context, message: &str) {
-        if let Err(err) = self {
-            error!(context, "{}: {}", message, err);
-        }
+    fn log_err(self, context: &context::Context, message: &str) -> Result<T, E> {
+        self.map_err(|err| {
+            warn!(context, "{}: {}", message, err);
+            err
+        })
+    }
+
+    fn log_warn(self, wrapper: &ContextWrapper, message: &str) -> Result<T, E> {
+        self.map_err(|err| {
+            unsafe {
+                wrapper.warning(&format!("{}: {}", message, err));
+            }
+            err
+        })
    }
 }

@@ -3127,3 +3373,68 @@ fn convert_and_prune_message_ids(msg_ids: *const u32, msg_cnt: libc::c_int) -> V

    msg_ids
 }
+
+// dc_provider_t
+
+#[no_mangle]
+pub type dc_provider_t = provider::Provider;
+
+#[no_mangle]
+pub unsafe extern "C" fn dc_provider_new_from_email(
+    context: *const dc_context_t,
+    addr: *const libc::c_char,
+) -> *const dc_provider_t {
+    if context.is_null() || addr.is_null() {
+        eprintln!("ignoring careless call to dc_provider_new_from_email()");
+        return ptr::null();
+    }
+    let addr = to_string_lossy(addr);
+    match provider::get_provider_info(addr.as_str()) {
+        Some(provider) => provider,
+        None => ptr::null_mut(),
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn dc_provider_get_overview_page(
+    provider: *const dc_provider_t,
+) -> *mut libc::c_char {
+    if provider.is_null() {
+        eprintln!("ignoring careless call to dc_provider_get_overview_page()");
+        return "".strdup();
+    }
+    let provider = &*provider;
+    provider.overview_page.strdup()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn dc_provider_get_before_login_hint(
+    provider: *const dc_provider_t,
+) -> *mut libc::c_char {
+    if provider.is_null() {
+        eprintln!("ignoring careless call to dc_provider_get_before_login_hint()");
+        return "".strdup();
+    }
+    let provider = &*provider;
+    provider.before_login_hint.strdup()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn dc_provider_get_status(provider: *const dc_provider_t) -> libc::c_int {
+    if provider.is_null() {
+        eprintln!("ignoring careless call to dc_provider_get_status()");
+        return 0;
+    }
+    let provider = &*provider;
+    provider.status as libc::c_int
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn dc_provider_unref(provider: *mut dc_provider_t) {
+    if provider.is_null() {
+        eprintln!("ignoring careless call to dc_provider_unref()");
+        return;
+    }
+    // currently, there is nothing to free, the provider info is a static object.
+    // this may change once we start localizing string.
+}
--- a/deltachat-ffi/src/providers.rs
+++ b/deltachat-ffi/src/providers.rs
@@ -1,93 +0,0 @@
-extern crate deltachat_provider_database;
-
-use std::ptr;
-
-use crate::string::{to_string_lossy, StrExt};
-use deltachat_provider_database::StatusState;
-
-#[no_mangle]
-pub type dc_provider_t = deltachat_provider_database::Provider;
-
-#[no_mangle]
-pub unsafe extern "C" fn dc_provider_new_from_domain(
-    domain: *const libc::c_char,
-) -> *const dc_provider_t {
-    match deltachat_provider_database::get_provider_info(&to_string_lossy(domain)) {
-        Some(provider) => provider,
-        None => ptr::null(),
-    }
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn dc_provider_new_from_email(
-    email: *const libc::c_char,
-) -> *const dc_provider_t {
-    let email = to_string_lossy(email);
-    let domain = deltachat_provider_database::get_domain_from_email(&email);
-    match deltachat_provider_database::get_provider_info(domain) {
-        Some(provider) => provider,
-        None => ptr::null(),
-    }
-}
-
-macro_rules! null_guard {
-    ($context:tt) => {
-        if $context.is_null() {
-            return ptr::null_mut() as *mut libc::c_char;
-        }
-    };
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn dc_provider_get_overview_page(
-    provider: *const dc_provider_t,
-) -> *mut libc::c_char {
-    null_guard!(provider);
-    format!(
-        "{}/{}",
-        deltachat_provider_database::PROVIDER_OVERVIEW_URL,
-        (*provider).overview_page
-    )
-    .strdup()
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn dc_provider_get_name(provider: *const dc_provider_t) -> *mut libc::c_char {
-    null_guard!(provider);
-    (*provider).name.strdup()
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn dc_provider_get_markdown(
-    provider: *const dc_provider_t,
-) -> *mut libc::c_char {
-    null_guard!(provider);
-    (*provider).markdown.strdup()
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn dc_provider_get_status_date(
-    provider: *const dc_provider_t,
-) -> *mut libc::c_char {
-    null_guard!(provider);
-    (*provider).status.date.strdup()
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn dc_provider_get_status(provider: *const dc_provider_t) -> u32 {
-    if provider.is_null() {
-        return 0;
-    }
-    match (*provider).status.state {
-        StatusState::OK => 1,
-        StatusState::PREPARATION => 2,
-        StatusState::BROKEN => 3,
-    }
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn dc_provider_unref(_provider: *const dc_provider_t) {
-    ()
-}
-
-// TODO expose general provider overview url?
--- a/deltachat_derive/Cargo.toml
+++ b/deltachat_derive/Cargo.toml
@@ -1,12 +1,13 @@
 [package]
 name = "deltachat_derive"
-version = "0.1.0"
-authors = ["Dmitry Bogatov <KAction@debian.org>"]
+version = "2.0.0"
+authors = ["Delta Chat Developers (ML) <delta@codespeak.net>"]
 edition = "2018"
+license = "MPL-2.0"

 [lib]
 proc-macro = true

 [dependencies]
-syn = "0.14.4"
-quote = "0.6.3"
+syn = "1.0.13"
+quote = "1.0.2"
--- a/examples/repl/cmdline.rs
+++ b/examples/repl/cmdline.rs
@@ -1,9 +1,8 @@
 use std::path::Path;
 use std::str::FromStr;

-use deltachat::chat::{self, Chat};
+use deltachat::chat::{self, Chat, ChatId};
 use deltachat::chatlist::*;
-use deltachat::config;
 use deltachat::constants::*;
 use deltachat::contact::*;
 use deltachat::context::*;
@@ -19,15 +18,16 @@ use deltachat::peerstate::*;
 use deltachat::qr::*;
 use deltachat::sql;
 use deltachat::Event;
+use deltachat::{config, provider};

-/// Reset database tables. This function is called from Core cmdline.
+/// Reset database tables.
 /// Argument is a bitmask, executing single or multiple actions in one call.
 /// e.g. bitmask 7 triggers actions definded with bits 1, 2 and 4.
-pub fn dc_reset_tables(context: &Context, bits: i32) -> i32 {
-    info!(context, "Resetting tables ({})...", bits);
+fn dc_reset_tables(context: &Context, bits: i32) -> i32 {
+    println!("Resetting tables ({})...", bits);
    if 0 != bits & 1 {
        sql::execute(context, &context.sql, "DELETE FROM jobs;", params![]).unwrap();
-        info!(context, "(1) Jobs reset.");
+        println!("(1) Jobs reset.");
    }
    if 0 != bits & 2 {
        sql::execute(
@@ -37,11 +37,11 @@ pub fn dc_reset_tables(context: &Context, bits: i32) -> i32 {
            params![],
        )
        .unwrap();
-        info!(context, "(2) Peerstates reset.");
+        println!("(2) Peerstates reset.");
    }
    if 0 != bits & 4 {
        sql::execute(context, &context.sql, "DELETE FROM keypairs;", params![]).unwrap();
-        info!(context, "(4) Private keypairs reset.");
+        println!("(4) Private keypairs reset.");
    }
    if 0 != bits & 8 {
        sql::execute(
@@ -80,11 +80,11 @@ pub fn dc_reset_tables(context: &Context, bits: i32) -> i32 {
        )
        .unwrap();
        sql::execute(context, &context.sql, "DELETE FROM leftgrps;", params![]).unwrap();
-        info!(context, "(8) Rest but server config reset.");
+        println!("(8) Rest but server config reset.");
    }

    context.call_cb(Event::MsgsChanged {
-        chat_id: 0,
+        chat_id: ChatId::new(0),
        msg_id: MsgId::new(0),
    });

@@ -94,7 +94,9 @@ pub fn dc_reset_tables(context: &Context, bits: i32) -> i32 {
 fn dc_poke_eml_file(context: &Context, filename: impl AsRef<Path>) -> Result<(), Error> {
    let data = dc_read_file(context, filename)?;

-    dc_receive_imf(context, &data, "import", 0, 0);
+    if let Err(err) = dc_receive_imf(context, &data, "import", 0, 0) {
+        println!("dc_receive_imf errored: {:?}", err);
+    }
    Ok(())
 }

@@ -153,7 +155,7 @@ fn poke_spec(context: &Context, spec: Option<&str>) -> libc::c_int {
                let name = name_f.to_string_lossy();
                if name.ends_with(".eml") {
                    let path_plus_name = format!("{}/{}", &real_spec, name);
-                    info!(context, "Import: {}", path_plus_name);
+                    println!("Import: {}", path_plus_name);
                    if dc_poke_eml_file(context, path_plus_name).is_ok() {
                        read_cnt += 1
                    }
@@ -161,13 +163,10 @@ fn poke_spec(context: &Context, spec: Option<&str>) -> libc::c_int {
            }
        }
    }
-    info!(
-        context,
-        "Import: {} items read from \"{}\".", read_cnt, &real_spec
-    );
+    println!("Import: {} items read from \"{}\".", read_cnt, &real_spec);
    if read_cnt > 0 {
        context.call_cb(Event::MsgsChanged {
-            chat_id: 0,
+            chat_id: ChatId::new(0),
            msg_id: MsgId::new(0),
        });
    }
@@ -188,8 +187,7 @@ fn log_msg(context: &Context, prefix: impl AsRef<str>, msg: &Message) {
    };
    let temp2 = dc_timestamp_to_str(msg.get_timestamp());
    let msgtext = msg.get_text();
-    info!(
-        context,
+    println!(
        "{}{}{}{}: {} (Contact#{}): {} {}{}{}{}{} [{}]",
        prefix.as_ref(),
        msg.get_id(),
@@ -223,16 +221,14 @@ fn log_msglist(context: &Context, msglist: &Vec<MsgId>) -> Result<(), Error> {
    let mut lines_out = 0;
    for &msg_id in msglist {
        if msg_id.is_daymarker() {
-            info!(
-                context,
+            println!(
                "--------------------------------------------------------------------------------"
            );

            lines_out += 1
        } else if !msg_id.is_special() {
            if lines_out == 0 {
-                info!(
-                    context,
+                println!(
                    "--------------------------------------------------------------------------------",
                );
                lines_out += 1
@@ -242,8 +238,7 @@ fn log_msglist(context: &Context, msglist: &Vec<MsgId>) -> Result<(), Error> {
        }
    }
    if lines_out > 0 {
-        info!(
-            context,
+        println!(
            "--------------------------------------------------------------------------------"
        );
    }
@@ -293,7 +288,7 @@ fn log_contactlist(context: &Context, contacts: &Vec<u32>) {
                );
            }

-            info!(context, "Contact#{}: {}{}", contact_id, line, line2);
+            println!("Contact#{}: {}{}", contact_id, line, line2);
        }
    }
 }
@@ -304,7 +299,7 @@ fn chat_prefix(chat: &Chat) -> &'static str {

 pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
    let chat_id = *context.cmdline_sel_chat_id.read().unwrap();
-    let mut sel_chat = if chat_id > 0 {
+    let mut sel_chat = if !chat_id.is_unset() {
        Chat::load_from_db(context, chat_id).ok()
    } else {
        None
@@ -397,6 +392,7 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
                 getqr [<chat-id>]\n\
                 getbadqr\n\
                 checkqr <qr-content>\n\
+                 providerinfo <addr>\n\
                 event <event-id to test>\n\
                 fileinfo <file>\n\
                 emptyserver <flags> (1=MVBOX 2=INBOX)\n\
@@ -489,7 +485,7 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
            println!("{:#?}", context.get_info());
        }
        "interrupt" => {
-            interrupt_inbox_idle(context, true);
+            interrupt_inbox_idle(context);
        }
        "maybenetwork" => {
            maybe_network(context);
@@ -508,20 +504,18 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {

            let cnt = chatlist.len();
            if cnt > 0 {
-                info!(
-                    context,
+                println!(
                    "================================================================================"
                );

                for i in (0..cnt).rev() {
                    let chat = Chat::load_from_db(context, chatlist.get_chat_id(i))?;
-                    info!(
-                        context,
+                    println!(
                        "{}#{}: {} [{} fresh]",
                        chat_prefix(&chat),
                        chat.get_id(),
                        chat.get_name(),
-                        chat::get_fresh_msg_cnt(context, chat.get_id()),
+                        chat.get_id().get_fresh_msg_cnt(context),
                    );
                    let lot = chatlist.get_summary(context, i, Some(&chat));
                    let statestr = if chat.is_archived() {
@@ -538,8 +532,7 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
                    let timestr = dc_timestamp_to_str(lot.get_timestamp());
                    let text1 = lot.get_text1();
                    let text2 = lot.get_text2();
-                    info!(
-                        context,
+                    println!(
                        "{}{}{}{} [{}]{}",
                        text1.unwrap_or(""),
                        if text1.is_some() { ": " } else { "" },
@@ -552,14 +545,13 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
                            ""
                        },
                    );
-                    info!(
-                        context,
+                    println!(
                        "================================================================================"
                    );
                }
            }
-            if location::is_sending_locations_to_chat(context, 0) {
-                info!(context, "Location streaming enabled.");
+            if location::is_sending_locations_to_chat(context, ChatId::new(0)) {
+                println!("Location streaming enabled.");
            }
            println!("{} chats", cnt);
        }
@@ -568,8 +560,8 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
                bail!("Argument [chat-id] is missing.");
            }
            if !arg1.is_empty() {
-                let chat_id = arg1.parse()?;
-                println!("Selecting chat #{}", chat_id);
+                let chat_id = ChatId::new(arg1.parse()?);
+                println!("Selecting chat {}", chat_id);
                sel_chat = Some(Chat::load_from_db(context, chat_id)?);
                *context.cmdline_sel_chat_id.write().unwrap() = chat_id;
            }
@@ -587,8 +579,7 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
            } else {
                format!("{} member(s)", members.len())
            };
-            info!(
-                context,
+            println!(
                "{}#{}: {} [{}]{}{}",
                chat_prefix(sel_chat),
                sel_chat.get_id(),
@@ -608,14 +599,11 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
                },
            );
            log_msglist(context, &msglist)?;
-            if let Some(draft) = chat::get_draft(context, sel_chat.get_id())? {
+            if let Some(draft) = sel_chat.get_id().get_draft(context)? {
                log_msg(context, "Draft", &draft);
            }

-            println!(
-                "{} messages.",
-                chat::get_msg_cnt(context, sel_chat.get_id())
-            );
+            println!("{} messages.", sel_chat.get_id().get_msg_cnt(context));
            chat::marknoticed_chat(context, sel_chat.get_id())?;
        }
        "createchat" => {
@@ -691,7 +679,7 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
            ensure!(sel_chat.is_some(), "No chat selected.");

            let contacts = chat::get_chat_contacts(context, sel_chat.as_ref().unwrap().get_id());
-            info!(context, "Memberlist:");
+            println!("Memberlist:");

            log_contactlist(context, &contacts);
            println!(
@@ -717,8 +705,7 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
            let default_marker = "-".to_string();
            for location in &locations {
                let marker = location.marker.as_ref().unwrap_or(&default_marker);
-                info!(
-                    context,
+                println!(
                    "Loc#{}: {}: lat={} lng={} acc={} Chat#{} Contact#{} {} {}",
                    location.location_id,
                    dc_timestamp_to_str(location.timestamp),
@@ -732,7 +719,7 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
                );
            }
            if locations.is_empty() {
-                info!(context, "No locations.");
+                println!("No locations.");
            }
        }
        "sendlocations" => {
@@ -798,7 +785,7 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
            let chat = if let Some(ref sel_chat) = sel_chat {
                sel_chat.get_id()
            } else {
-                0 as libc::c_uint
+                ChatId::new(0)
            };

            let msglist = context.search_msgs(chat, arg1);
@@ -812,14 +799,14 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
            if !arg1.is_empty() {
                let mut draft = Message::new(Viewtype::Text);
                draft.set_text(Some(arg1.to_string()));
-                chat::set_draft(
-                    context,
-                    sel_chat.as_ref().unwrap().get_id(),
-                    Some(&mut draft),
-                );
+                sel_chat
+                    .as_ref()
+                    .unwrap()
+                    .get_id()
+                    .set_draft(context, Some(&mut draft));
                println!("Draft saved.");
            } else {
-                chat::set_draft(context, sel_chat.as_ref().unwrap().get_id(), None);
+                sel_chat.as_ref().unwrap().get_id().set_draft(context, None);
                println!("Draft deleted.");
            }
        }
@@ -857,13 +844,13 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
        }
        "archive" | "unarchive" => {
            ensure!(!arg1.is_empty(), "Argument <chat-id> missing.");
-            let chat_id = arg1.parse()?;
-            chat::archive(context, chat_id, arg0 == "archive")?;
+            let chat_id = ChatId::new(arg1.parse()?);
+            chat_id.set_archived(context, arg0 == "archive")?;
        }
        "delchat" => {
            ensure!(!arg1.is_empty(), "Argument <chat-id> missing.");
-            let chat_id = arg1.parse()?;
-            chat::delete(context, chat_id)?;
+            let chat_id = ChatId::new(arg1.parse()?);
+            chat_id.delete(context)?;
        }
        "msginfo" => {
            ensure!(!arg1.is_empty(), "Argument <msg-id> missing.");
@@ -879,12 +866,12 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
        }
        "forward" => {
            ensure!(
-                !arg1.is_empty() && arg2.is_empty(),
+                !arg1.is_empty() && !arg2.is_empty(),
                "Arguments <msg-id> <chat-id> expected"
            );

            let mut msg_ids = [MsgId::new(0); 1];
-            let chat_id = arg2.parse()?;
+            let chat_id = ChatId::new(arg2.parse()?);
            msg_ids[0] = MsgId::new(arg1.parse()?);
            chat::forward_msgs(context, &msg_ids, chat_id)?;
        }
@@ -936,7 +923,14 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
            let contact = Contact::get_by_id(context, contact_id)?;
            let name_n_addr = contact.get_name_n_addr();

-            let mut res = format!("Contact info for: {}:\n\n", name_n_addr);
+            let mut res = format!(
+                "Contact info for: {}:\nIcon: {}\n",
+                name_n_addr,
+                match contact.get_profile_image(context) {
+                    Some(image) => image.to_str().unwrap().to_string(),
+                    None => "NoIcon".to_string(),
+                }
+            );

            res += &Contact::get_encrinfo(context, contact_id)?;

@@ -973,6 +967,28 @@ pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
                res.get_text2()
            );
        }
+        "setqr" => {
+            ensure!(!arg1.is_empty(), "Argument <qr-content> missing.");
+            set_config_from_qr(context, arg1);
+        }
+        "providerinfo" => {
+            ensure!(!arg1.is_empty(), "Argument <addr> missing.");
+            match provider::get_provider_info(arg1) {
+                Some(info) => {
+                    println!("Information for provider belonging to {}:", arg1);
+                    println!("status: {}", info.status as u32);
+                    println!("before_login_hint: {}", info.before_login_hint);
+                    println!("after_login_hint: {}", info.after_login_hint);
+                    println!("overview_page: {}", info.overview_page);
+                    for server in info.server.iter() {
+                        println!("server: {}:{}", server.hostname, server.port,);
+                    }
+                }
+                None => {
+                    println!("No information for provider belonging to {} found.", arg1);
+                }
+            }
+        }
        // TODO: implement this again, unclear how to match this through though, without writing a parser.
        // "event" => {
        //     ensure!(!arg1.is_empty(), "Argument <id> missing.");
--- a/examples/repl/main.rs
+++ b/examples/repl/main.rs
@@ -20,6 +20,7 @@ use std::process::Command;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex, RwLock};

+use deltachat::chat::ChatId;
 use deltachat::config;
 use deltachat::configure::*;
 use deltachat::context::*;
@@ -41,7 +42,7 @@ use self::cmdline::*;

 // Event Handler

-fn receive_event(_context: &Context, event: Event) -> libc::uintptr_t {
+fn receive_event(_context: &Context, event: Event) {
    match event {
        Event::Info(msg) => {
            /* do not show the event as this would fill the screen */
@@ -111,8 +112,6 @@ fn receive_event(_context: &Context, event: Event) -> libc::uintptr_t {
            print!("\x1b[33m{{Received {:?}}}\n\x1b[0m", event);
        }
    }
-
-    0
 }

 // Threads for waiting for messages and for jobs
@@ -202,7 +201,7 @@ fn stop_threads(context: &Context) {
        println!("Stopping threads");
        IS_RUNNING.store(false, Ordering::Relaxed);

-        interrupt_inbox_idle(context, true);
+        interrupt_inbox_idle(context);
        interrupt_mvbox_idle(context);
        interrupt_sentbox_idle(context);
        interrupt_smtp_idle(context);
@@ -486,9 +485,10 @@ fn handle_cmd(line: &str, ctx: Arc<RwLock<Context>>) -> Result<ExitResult, failu
        }
        "getqr" | "getbadqr" => {
            start_threads(ctx.clone());
-            if let Some(mut qr) =
-                dc_get_securejoin_qr(&ctx.read().unwrap(), arg1.parse().unwrap_or_default())
-            {
+            if let Some(mut qr) = dc_get_securejoin_qr(
+                &ctx.read().unwrap(),
+                ChatId::new(arg1.parse().unwrap_or_default()),
+            ) {
                if !qr.is_empty() {
                    if arg0 == "getbadqr" && qr.len() > 40 {
                        qr.replace_range(12..22, "0000000000")
--- a/examples/simple.rs
+++ b/examples/simple.rs
@@ -16,21 +16,18 @@ use deltachat::job::{
 };
 use deltachat::Event;

-fn cb(_ctx: &Context, event: Event) -> usize {
+fn cb(_ctx: &Context, event: Event) {
    print!("[{:?}]", event);

    match event {
        Event::ConfigureProgress(progress) => {
-            print!("  progress: {}\n", progress);
-            0
+            println!("  progress: {}", progress);
        }
        Event::Info(msg) | Event::Warning(msg) | Event::Error(msg) | Event::ErrorNetwork(msg) => {
-            print!("  {}\n", msg);
-            0
+            println!("  {}", msg);
        }
        _ => {
-            print!("\n");
-            0
+            println!();
        }
    }
 }
@@ -104,7 +101,7 @@ fn main() {
    println!("stopping threads");

    *running.write().unwrap() = false;
-    deltachat::job::interrupt_inbox_idle(&ctx, true);
+    deltachat::job::interrupt_inbox_idle(&ctx);
    deltachat::job::interrupt_smtp_idle(&ctx);

    println!("joining");
--- a/python/CHANGELOG
+++ b/python/CHANGELOG
@@ -1,6 +1,10 @@
-0.600.1
+0.700.0
 ---------

+- lots of new Python APIs
+
+- use rust core-beta23 
+
 - introduce automatic versioning via setuptools_scm, 
  based on py-X.Y.Z tags 

--- a/python/README.rst
+++ b/python/README.rst
@@ -3,41 +3,98 @@ deltachat python bindings
 =========================

 This package provides bindings to the deltachat-core_ Rust -library
-which provides imap/smtp/crypto handling as well as chat/group/messages
-handling to Android, Desktop and IO user interfaces.
+which implements IMAP/SMTP/MIME/PGP e-mail standards and offers
+a low-level Chat/Contact/Message API to user interfaces and bots.

-Installing pre-built packages (linux-only)
-==========================================

-If you have a linux system you may install the ``deltachat`` binary "wheel" package
+Installing bindings from source (Updated: 20-Jan-2020)
+=========================================================
+
+Install Rust and Cargo first.  Deltachat needs a specific nightly
+version, the easiest is probably to first install Rust stable from
+rustup and then use this to install the correct nightly version.
+
+Bootstrap Rust and Cargo by using rustup::
+
+   curl https://sh.rustup.rs -sSf | sh
+
+Then GIT clone the deltachat-core-rust repo and get the actual
+rust- and cargo-toolchain needed by deltachat::
+
+   git clone https://github.com/deltachat/deltachat-core-rust
+   cd deltachat-core-rust
+   rustup show
+
+To install the Delta Chat Python bindings make sure you have Python3 installed.
+E.g. on Debian-based systems `apt install python3 python3-pip
+python3-venv` should give you a usable python installation.
+
+Ensure you are in the deltachat-core-rust/python directory, create the
+virtual environment and activate it in your shell::
+
+   cd python
+   python3 -m venv venv  # or: virtualenv venv
+   source venv/bin/activate
+
+You should now be able to build the python bindings using the supplied script::
+
+   ./install_python_bindings.py
+
+The installation might take a while, depending on your machine.
+The bindings will be installed in release mode but with debug symbols.
+The release mode is currently necessary because some tests generate RSA keys
+which is prohibitively slow in non-release mode.
+
+After successful binding installation you can install a few more
+Python packages before running the tests::
+
+    python -m pip install pytest pytest-timeout pytest-rerunfailures requests
+    pytest -v tests
+
+
+running "live" tests with temporary accounts
+---------------------------------------------
+
+If you want to run "liveconfig" functional tests you can set
+``DCC_NEW_TMP_EMAIL`` to:
+
+- a particular https-url that you can ask for from the delta
+  chat devs. This is implemented on the server side via
+  the [mailadm](https://github.com/deltachat/mailadm) command line tool.
+
+- or the path of a file that contains two lines, each describing
+  via "addr=... mail_pw=..." a test account login that will
+  be used for the live tests.
+
+With ``DCC_NEW_TMP_EMAIL`` set pytest invocations will use real
+e-mail accounts and run through all functional "liveconfig" tests.
+
+
+Installing pre-built packages (Linux-only)
+========================================================
+
+If you have a Linux system you may try to install the ``deltachat`` binary "wheel" packages
 without any "build-from-source" steps.

-1. `Install virtualenv <https://virtualenv.pypa.io/en/stable/installation/>`_,
-   then create a fresh python environment and activate it in your shell::
+We suggest to `Install virtualenv <https://virtualenv.pypa.io/en/stable/installation/>`_,
+then create a fresh Python virtual environment and activate it in your shell::

        virtualenv venv  # or: python -m venv
        source venv/bin/activate

-   Afterwards, invoking ``python`` or ``pip install`` will only
-   modify files in your ``venv`` directory and leave your system installation
-   alone.
-
-2. Install the wheel for linux::
-
-        pip install deltachat
-
-    Verify it worked by typing::
-
-        python -c "import deltachat"
-
-
-Installing a wheel from a PR/branch
---------------------------------------
+Afterwards, invoking ``python`` or ``pip install`` only
+modifies files in your ``venv`` directory and leaves
+your system installation alone.

 For Linux, we automatically build wheels for all github PR branches
-and push them to a python package index. To install the latest github ``master`` branch::
+and push them to a python package index. To install the latest
+github ``master`` branch::

-    pip install -i https://m.devpi.net/dc/master deltachat
+    pip install --pre -i https://m.devpi.net/dc/master deltachat
+
+To verify it worked::
+
+    python -c "import deltachat"

 .. note::

@@ -46,65 +103,6 @@ and push them to a python package index. To install the latest github ``master``
    `in contact with us <https://delta.chat/en/contribute>`_.


-Installing bindings from source
-===============================
-
-If you can't use "binary" method above then you need to compile
-to core deltachat library::
-
-    git clone https://github.com/deltachat/deltachat-core-rust
-    cd deltachat-core-rust
-    cd python
-
-If you don't have one active, create and activate a python "virtualenv":
-
-    python virtualenv venv  # or python -m venv
-    source venv/bin/activate
-
-Afterwards ``which python`` tells you that it comes out of the "venv"
-directory that contains all python install artifacts. Let's first
-install test tools::
-
-    pip install pytest pytest-timeout pytest-rerunfailures requests
-
-then cargo-build and install the deltachat bindings::
-
-    python install_python_bindings.py
-
-The bindings will be installed in release mode but with debug symbols.
-The release mode is necessary because some tests generate RSA keys
-which is prohibitively slow in debug mode.
-
-After successful binding installation you can finally run the tests::
-
-    pytest -v tests
-
-.. note::
-
-    Some tests are sometimes failing/hanging because of
-    https://github.com/deltachat/deltachat-core-rust/issues/331
-    and
-    https://github.com/deltachat/deltachat-core-rust/issues/326
-
-
-running "live" tests (experimental)
-----------------------------------
-
-If you want to run "liveconfig" functional tests you can set
-``DCC_PY_LIVECONFIG`` to:
-
- a particular https-url that you can ask for from the delta
-  chat devs.
-
- or the path of a file that contains two lines, each describing
-  via "addr=... mail_pw=..." a test account login that will
-  be used for the live tests.
-
-With ``DCC_PY_LIVECONFIG`` set pytest invocations will use real
-e-mail accounts and run through all functional "liveconfig" tests.
-
-
-
 Code examples
 =============

@@ -115,15 +113,11 @@ You may look at `examples <https://py.delta.chat/examples.html>`_.
 .. _`deltachat-core`: https://github.com/deltachat/deltachat-core-rust


-Building manylinux1 wheels
-==========================
-
-.. note::
-
-   This section may not fully work.
+Building manylinux1 based wheels
+================================

 Building portable manylinux1 wheels which come with libdeltachat.so
-and all it's dependencies is easy using the provided docker tooling.
+can be done with docker-tooling.

 using docker pull / premade images
 ------------------------------------
@@ -136,9 +130,9 @@ organization::

 This docker image can be used to run tests and build Python wheels for all interpreters::

-    $ bash ci_scripts/ci_run.sh
-
-This command runs tests and build-wheel scripts in a docker container.
+    $ docker run -e DCC_NEW_TMP_EMAIL \
+       --rm -it -v \$(pwd):/mnt -w /mnt \
+       deltachat/coredeps ci_scripts/run_all.sh


 Optionally build your own docker image
--- a/python/install_python_bindings.py
+++ b/python/install_python_bindings.py
@@ -11,18 +11,15 @@ import sys
 if __name__ == "__main__":
    target = os.environ.get("DCC_RS_TARGET")
    if target is None:
-        os.environ["DCC_RS_TARGET"] = target = "release"
+        os.environ["DCC_RS_TARGET"] = target = "debug"
    if "DCC_RS_DEV" not in os.environ:
        dn = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
        os.environ["DCC_RS_DEV"] = dn

-    # build the core library  in release + debug mode because
-    # as of Nov 2019 rPGP generates RSA keys which take
-    # prohibitively long for non-release installs
-    os.environ["RUSTFLAGS"] = "-g"
-    subprocess.check_call([
-        "cargo", "build", "-p", "deltachat_ffi", "--" + target
-    ])
+    cmd = ["cargo", "build", "-p", "deltachat_ffi"]
+    if target == 'release':
+        cmd.append("--release")
+    subprocess.check_call(cmd)
    subprocess.check_call("rm -rf build/ src/deltachat/*.so" , shell=True)

    if len(sys.argv) <= 1 or sys.argv[1] != "onlybuild":
--- a/python/setup.py
+++ b/python/setup.py
@@ -13,6 +13,7 @@ def main():
            "root": "..",
            "relative_to": __file__,
            'tag_regex': r'^(?P<prefix>py-)?(?P<version>[^\+]+)(?P<suffix>.*)?$',
+            'git_describe_command': "git describe --dirty --tags --long --match py-*.*",
        },
        description='Python bindings for the Delta Chat Core library using CFFI against the Rust-implemented libdeltachat',
        long_description=long_description,
--- a/python/src/deltachat/account.py
+++ b/python/src/deltachat/account.py
@@ -3,6 +3,7 @@
 from __future__ import print_function
 import atexit
 import threading
+import os
 import re
 import time
 from array import array
@@ -25,7 +26,7 @@ class Account(object):
    by the underlying deltachat core library.  All public Account methods are
    meant to be memory-safe and return memory-safe objects.
    """
-    def __init__(self, db_path, logid=None, eventlogging=True, debug=True):
+    def __init__(self, db_path, logid=None, eventlogging=True, os_name=None, debug=True):
        """ initialize account object.

        :param db_path: a path to the account database. The database
@@ -33,10 +34,11 @@ class Account(object):
        :param logid: an optional logging prefix that should be used with
                      the default internal logging.
        :param eventlogging: if False no eventlogging and no context callback will be configured
+        :param os_name: this will be put to the X-Mailer header in outgoing messages
        :param debug: turn on debug logging for events.
        """
        self._dc_context = ffi.gc(
-            lib.dc_context_new(lib.py_dc_callback, ffi.NULL, ffi.NULL),
+            lib.dc_context_new(lib.py_dc_callback, ffi.NULL, as_dc_charpointer(os_name)),
            _destroy_dc_context,
        )
        if eventlogging:
@@ -94,9 +96,12 @@ class Account(object):
        """
        self._check_config_key(name)
        name = name.encode("utf8")
-        value = value.encode("utf8")
        if name == b"addr" and self.is_configured():
            raise ValueError("can not change 'addr' after account is configured.")
+        if value is not None:
+            value = value.encode("utf8")
+        else:
+            value = ffi.NULL
        lib.dc_set_config(self._dc_context, name, value)

    def get_config(self, name):
@@ -113,6 +118,18 @@ class Account(object):
        assert res != ffi.NULL, "config value not found for: {!r}".format(name)
        return from_dc_charpointer(res)

+    def _preconfigure_keypair(self, addr, public, secret):
+        """See dc_preconfigure_keypair() in deltachat.h.
+
+        In other words, you don't need this.
+        """
+        res = lib.dc_preconfigure_keypair(self._dc_context,
+                                          as_dc_charpointer(addr),
+                                          as_dc_charpointer(public),
+                                          as_dc_charpointer(secret))
+        if res == 0:
+            raise Exception("Failed to set key")
+
    def configure(self, **kwargs):
        """ set config values and configure this account.

@@ -132,6 +149,18 @@ class Account(object):
        """
        return lib.dc_is_configured(self._dc_context)

+    def set_avatar(self, img_path):
+        """Set self avatar.
+
+        :raises ValueError: if profile image could not be set
+        :returns: None
+        """
+        if img_path is None:
+            self.set_config("selfavatar", None)
+        else:
+            assert os.path.exists(img_path), img_path
+            self.set_config("selfavatar", img_path)
+
    def check_is_configured(self):
        """ Raise ValueError if this account is not configured. """
        if not self.is_configured():
@@ -561,6 +590,11 @@ class IOThreads:

    def stop(self, wait=False):
        self._thread_quitflag = True
+
+        # Workaround for a race condition. Make sure that thread is
+        # not in between checking for quitflag and entering idle.
+        time.sleep(0.5)
+
        lib.dc_interrupt_imap_idle(self._dc_context)
        lib.dc_interrupt_smtp_idle(self._dc_context)
        lib.dc_interrupt_mvbox_idle(self._dc_context)
@@ -583,23 +617,28 @@ class IOThreads:
        self._log_event("py-bindings-info", 0, "MVBOX THREAD START")
        while not self._thread_quitflag:
            lib.dc_perform_mvbox_jobs(self._dc_context)
-            lib.dc_perform_mvbox_fetch(self._dc_context)
-            lib.dc_perform_mvbox_idle(self._dc_context)
+            if not self._thread_quitflag:
+                lib.dc_perform_mvbox_fetch(self._dc_context)
+            if not self._thread_quitflag:
+                lib.dc_perform_mvbox_idle(self._dc_context)
        self._log_event("py-bindings-info", 0, "MVBOX THREAD FINISHED")

    def sentbox_thread_run(self):
        self._log_event("py-bindings-info", 0, "SENTBOX THREAD START")
        while not self._thread_quitflag:
            lib.dc_perform_sentbox_jobs(self._dc_context)
-            lib.dc_perform_sentbox_fetch(self._dc_context)
-            lib.dc_perform_sentbox_idle(self._dc_context)
+            if not self._thread_quitflag:
+                lib.dc_perform_sentbox_fetch(self._dc_context)
+            if not self._thread_quitflag:
+                lib.dc_perform_sentbox_idle(self._dc_context)
        self._log_event("py-bindings-info", 0, "SENTBOX THREAD FINISHED")

    def smtp_thread_run(self):
        self._log_event("py-bindings-info", 0, "SMTP THREAD START")
        while not self._thread_quitflag:
            lib.dc_perform_smtp_jobs(self._dc_context)
-            lib.dc_perform_smtp_idle(self._dc_context)
+            if not self._thread_quitflag:
+                lib.dc_perform_smtp_idle(self._dc_context)
        self._log_event("py-bindings-info", 0, "SMTP THREAD FINISHED")


--- a/python/src/deltachat/chat.py
+++ b/python/src/deltachat/chat.py
@@ -2,6 +2,7 @@

 import mimetypes
 import calendar
+import json
 from datetime import datetime
 import os
 from .cutil import as_dc_charpointer, from_dc_charpointer, iter_array
@@ -57,6 +58,13 @@ class Chat(object):
        """
        return self.id == const.DC_CHAT_ID_DEADDROP

+    def is_muted(self):
+        """ return true if this chat is muted.
+
+        :returns: True if chat is muted, False otherwise.
+        """
+        return lib.dc_chat_is_muted(self._dc_chat)
+
    def is_promoted(self):
        """ return True if this chat is promoted, i.e.
        the member contacts are aware of their membership,
@@ -83,12 +91,43 @@ class Chat(object):
    def set_name(self, name):
        """ set name of this chat.

-        :param: name as a unicode string.
+        :param name: as a unicode string.
        :returns: None
        """
        name = as_dc_charpointer(name)
        return lib.dc_set_chat_name(self._dc_context, self.id, name)

+    def mute(self, duration=None):
+        """ mutes the chat
+
+        :param duration: Number of seconds to mute the chat for. None to mute until unmuted again.
+        :returns: None
+        """
+        if duration is None:
+            mute_duration = -1
+        else:
+            mute_duration = duration
+        ret = lib.dc_set_chat_mute_duration(self._dc_context, self.id, mute_duration)
+        if not bool(ret):
+            raise ValueError("Call to dc_set_chat_mute_duration failed")
+
+    def unmute(self):
+        """ unmutes the chat
+
+        :returns: None
+        """
+        ret = lib.dc_set_chat_mute_duration(self._dc_context, self.id, 0)
+        if not bool(ret):
+            raise ValueError("Failed to unmute chat")
+
+    def get_mute_duration(self):
+        """ Returns the number of seconds until the mute of this chat is lifted.
+
+        :param duration:
+        :returns: Returns the number of seconds the chat is still muted for. (0 for not muted, -1 forever muted)
+        """
+        return bool(lib.dc_chat_get_remaining_mute_duration(self.id))
+
    def get_type(self):
        """ return type of this chat.

@@ -108,6 +147,30 @@ class Chat(object):

    # ------  chat messaging API ------------------------------

+    def send_msg(self, msg):
+        """send a message by using a ready Message object.
+
+        :param msg: a :class:`deltachat.message.Message` instance
+           previously returned by
+           e.g. :meth:`deltachat.message.Message.new_empty` or
+           :meth:`prepare_file`.
+        :raises ValueError: if message can not be sent.
+
+        :returns: a :class:`deltachat.message.Message` instance as
+           sent out.  This is the same object as was passed in, which
+           has been modified with the new state of the core.
+        """
+        if msg.is_out_preparing():
+            assert msg.id != 0
+            # get a fresh copy of dc_msg, the core needs it
+            msg = Message.from_db(self.account, msg.id)
+        sent_id = lib.dc_send_msg(self._dc_context, self.id, msg._dc_msg)
+        if sent_id == 0:
+            raise ValueError("message could not be sent")
+        # modify message in place to avoid bad state for the caller
+        msg._dc_msg = Message.from_db(self.account, sent_id)._dc_msg
+        return msg
+
    def send_text(self, text):
        """ send a text message and return the resulting Message instance.

@@ -129,9 +192,12 @@ class Chat(object):
        :raises ValueError: if message can not be send/chat does not exist.
        :returns: the resulting :class:`deltachat.message.Message` instance
        """
-        msg = self.prepare_message_file(path=path, mime_type=mime_type)
-        self.send_prepared(msg)
-        return msg
+        msg = Message.new_empty(self.account, view_type="file")
+        msg.set_file(path, mime_type)
+        sent_id = lib.dc_send_msg(self._dc_context, self.id, msg._dc_msg)
+        if sent_id == 0:
+            raise ValueError("message could not be sent")
+        return Message.from_db(self.account, sent_id)

    def send_image(self, path):
        """ send an image message and return the resulting Message instance.
@@ -141,9 +207,12 @@ class Chat(object):
        :returns: the resulting :class:`deltachat.message.Message` instance
        """
        mime_type = mimetypes.guess_type(path)[0]
-        msg = self.prepare_message_file(path=path, mime_type=mime_type, view_type="image")
-        self.send_prepared(msg)
-        return msg
+        msg = Message.new_empty(self.account, view_type="image")
+        msg.set_file(path, mime_type)
+        sent_id = lib.dc_send_msg(self._dc_context, self.id, msg._dc_msg)
+        if sent_id == 0:
+            raise ValueError("message could not be sent")
+        return Message.from_db(self.account, sent_id)

    def prepare_message(self, msg):
        """ create a new prepared message.
@@ -242,6 +311,12 @@ class Chat(object):
        """
        return lib.dc_marknoticed_chat(self._dc_context, self.id)

+    def get_summary(self):
+        """ return dictionary with summary information. """
+        dc_res = lib.dc_chat_get_info_json(self._dc_context, self.id)
+        s = from_dc_charpointer(dc_res)
+        return json.loads(s)
+
    # ------  group management API ------------------------------

    def add_contact(self, contact):
@@ -324,6 +399,18 @@ class Chat(object):
            return None
        return from_dc_charpointer(dc_res)

+    def get_color(self):
+        """return the color of the chat.
+        :returns: color as 0x00rrggbb
+        """
+        return lib.dc_chat_get_color(self._dc_chat)
+
+    def get_subtitle(self):
+        """return the subtitle of the chat
+        :returns: the subtitle
+        """
+        return from_dc_charpointer(lib.dc_chat_get_subtitle(self._dc_chat))
+
    # ------  location streaming API ------------------------------

    def is_sending_locations(self):
@@ -332,6 +419,12 @@ class Chat(object):
        """
        return lib.dc_is_sending_locations_to_chat(self._dc_context, self.id)

+    def is_archived(self):
+        """return True if this chat is archived.
+        :returns: True if archived.
+        """
+        return lib.dc_chat_get_archived(self._dc_chat)
+
    def enable_sending_locations(self, seconds):
        """enable sending locations for this chat.

--- a/python/src/deltachat/const.py
+++ b/python/src/deltachat/const.py
@@ -68,7 +68,6 @@ DC_LP_SMTP_SOCKET_SSL = 0x20000
 DC_LP_SMTP_SOCKET_PLAIN = 0x40000
 DC_CERTCK_AUTO = 0
 DC_CERTCK_STRICT = 1
-DC_CERTCK_ACCEPT_INVALID_HOSTNAMES = 2
 DC_CERTCK_ACCEPT_INVALID_CERTIFICATES = 3
 DC_EMPTY_MVBOX = 0x01
 DC_EMPTY_INBOX = 0x02
--- a/python/src/deltachat/contact.py
+++ b/python/src/deltachat/contact.py
@@ -47,3 +47,13 @@ class Contact(object):
    def is_verified(self):
        """ Return True if the contact is verified. """
        return lib.dc_contact_is_verified(self._dc_contact)
+
+    def get_profile_image(self):
+        """Get contact profile image.
+
+        :returns: path to profile image, None if no profile image exists.
+        """
+        dc_res = lib.dc_contact_get_profile_image(self._dc_contact)
+        if dc_res == ffi.NULL:
+            return None
+        return from_dc_charpointer(dc_res)
--- a/python/src/deltachat/message.py
+++ b/python/src/deltachat/message.py
@@ -1,7 +1,6 @@
 """ The Message object. """

 import os
-import shutil
 from . import props
 from .cutil import from_dc_charpointer, as_dc_charpointer
 from .capi import lib, ffi
@@ -58,8 +57,6 @@ class Message(object):

    def set_text(self, text):
        """set text of this message. """
-        assert self.id > 0, "message not prepared"
-        assert self.is_out_preparing()
        lib.dc_msg_set_text(self._dc_msg, as_dc_charpointer(text))

    @props.with_doc
@@ -72,19 +69,6 @@ class Message(object):
        mtype = ffi.NULL if mime_type is None else as_dc_charpointer(mime_type)
        if not os.path.exists(path):
            raise ValueError("path does not exist: {!r}".format(path))
-        blobdir = self.account.get_blobdir()
-        if not path.startswith(blobdir):
-            for i in range(50):
-                ext = "" if i == 0 else "-" + str(i)
-                dest = os.path.join(blobdir, os.path.basename(path) + ext)
-                if os.path.exists(dest):
-                    continue
-                shutil.copyfile(path, dest)
-                break
-            else:
-                raise ValueError("could not create blobdir-path for {}".format(path))
-            path = dest
-        assert path.startswith(blobdir), path
        lib.dc_msg_set_file(self._dc_msg, as_dc_charpointer(path), mtype)

    @props.with_doc
@@ -190,7 +174,7 @@ class Message(object):
    @property
    def _msgstate(self):
        if self.id == 0:
-            dc_msg = self.message._dc_msg
+            dc_msg = self._dc_msg
        else:
            # load message from db to get a fresh/current state
            dc_msg = ffi.gc(
--- a/python/src/deltachat/provider.py
+++ b/python/src/deltachat/provider.py
@@ -11,27 +11,18 @@ class ProviderNotFoundError(Exception):
 class Provider(object):
    """Provider information.

-    :param domain: The domain to get the provider info for, this is
-    normally the part following the `@` of the domain.
+    :param domain: The email to get the provider info for.
    """

-    def __init__(self, domain):
+    def __init__(self, account, addr):
        provider = ffi.gc(
-            lib.dc_provider_new_from_domain(as_dc_charpointer(domain)),
+            lib.dc_provider_new_from_email(account._dc_context, as_dc_charpointer(addr)),
            lib.dc_provider_unref,
        )
        if provider == ffi.NULL:
            raise ProviderNotFoundError("Provider not found")
        self._provider = provider

-    @classmethod
-    def from_email(cls, email):
-        """Create provider info from an email address.
-
-        :param email: Email address to get provider info for.
-        """
-        return cls(email.split('@')[-1])
-
    @property
    def overview_page(self):
        """URL to the overview page of the provider on providers.delta.chat."""
@@ -39,21 +30,10 @@ class Provider(object):
            lib.dc_provider_get_overview_page(self._provider))

    @property
-    def name(self):
-        """The name of the provider."""
-        return from_dc_charpointer(lib.dc_provider_get_name(self._provider))
-
-    @property
-    def markdown(self):
-        """Content of the information page, formatted as markdown."""
+    def get_before_login_hints(self):
+        """Should be shown to the user on login."""
        return from_dc_charpointer(
-            lib.dc_provider_get_markdown(self._provider))
-
-    @property
-    def status_date(self):
-        """The date the provider info was last updated, as a string."""
-        return from_dc_charpointer(
-            lib.dc_provider_get_status_date(self._provider))
+            lib.dc_provider_get_before_login_hints(self._provider))

    @property
    def status(self):
--- a/python/tests/conftest.py
+++ b/python/tests/conftest.py
@@ -1,5 +1,6 @@
 from __future__ import print_function
 import os
+import py
 import pytest
 import requests
 import time
@@ -15,16 +16,29 @@ def pytest_addoption(parser):
        help="a file with >=2 lines where each line "
             "contains NAME=VALUE config settings for one account"
    )
+    parser.addoption(
+        "--ignored", action="store_true",
+        help="Also run tests marked with the ignored marker",
+    )


 def pytest_configure(config):
+    config.addinivalue_line(
+        "markers", "ignored: Mark test as bing slow, skipped unless --ignored is used."
+    )
    cfg = config.getoption('--liveconfig')
    if not cfg:
-        cfg = os.getenv('DCC_PY_LIVECONFIG')
+        cfg = os.getenv('DCC_NEW_TMP_EMAIL')
        if cfg:
            config.option.liveconfig = cfg


+def pytest_runtest_setup(item):
+    if (list(item.iter_markers(name="ignored"))
+            and not item.config.getoption("ignored")):
+        pytest.skip("Ignored tests not requested, use --ignored")
+
+
 def pytest_report_header(config, startdir):
    summary = []

@@ -83,18 +97,22 @@ class SessionLiveConfigFromFile:


 class SessionLiveConfigFromURL:
-    def __init__(self, url, create_token):
+    def __init__(self, url):
        self.configlist = []
-        for i in range(2):
-            res = requests.post(url, json={"token_create_user": int(create_token)})
+        self.url = url
+
+    def get(self, index):
+        try:
+            return self.configlist[index]
+        except IndexError:
+            assert index == len(self.configlist), index
+            res = requests.post(self.url)
            if res.status_code != 200:
                pytest.skip("creating newtmpuser failed {!r}".format(res))
            d = res.json()
            config = dict(addr=d["email"], mail_pw=d["password"])
            self.configlist.append(config)
-
-    def get(self, index):
-        return self.configlist[index]
+            return config

    def exists(self):
        return bool(self.configlist)
@@ -105,14 +123,24 @@ def session_liveconfig(request):
    liveconfig_opt = request.config.option.liveconfig
    if liveconfig_opt:
        if liveconfig_opt.startswith("http"):
-            url, create_token = liveconfig_opt.split("#", 1)
-            return SessionLiveConfigFromURL(url, create_token)
+            return SessionLiveConfigFromURL(liveconfig_opt)
        else:
            return SessionLiveConfigFromFile(liveconfig_opt)


+@pytest.fixture(scope='session')
+def datadir():
+    """The py.path.local object of the test-data/ directory."""
+    for path in reversed(py.path.local(__file__).parts()):
+        datadir = path.join('test-data')
+        if datadir.isdir():
+            return datadir
+    else:
+        pytest.skip('test-data directory not found')
+
+
@pytest.fixture
-def acfactory(pytestconfig, tmpdir, request, session_liveconfig):
+def acfactory(pytestconfig, tmpdir, request, session_liveconfig, datadir):

    class AccountMaker:
        def __init__(self):
@@ -120,6 +148,8 @@ def acfactory(pytestconfig, tmpdir, request, session_liveconfig):
            self.offline_count = 0
            self._finalizers = []
            self.init_time = time.time()
+            self._generated_keys = ["alice", "bob", "charlie",
+                                    "dom", "elena", "fiona"]

        def finalize(self):
            while self._finalizers:
@@ -139,26 +169,32 @@ def acfactory(pytestconfig, tmpdir, request, session_liveconfig):
            ac._evlogger.set_timeout(2)
            return ac

+        def _preconfigure_key(self, account, addr):
+            # Only set a key if we haven't used it yet for another account.
+            if self._generated_keys:
+                keyname = self._generated_keys.pop(0)
+                fname_pub = "key/{name}-public.asc".format(name=keyname)
+                fname_sec = "key/{name}-secret.asc".format(name=keyname)
+                account._preconfigure_keypair(addr,
+                                              datadir.join(fname_pub).read(),
+                                              datadir.join(fname_sec).read())
+
        def get_configured_offline_account(self):
            ac = self.get_unconfigured_account()

            # do a pseudo-configured account
            addr = "addr{}@offline.org".format(self.offline_count)
            ac.set_config("addr", addr)
+            self._preconfigure_key(ac, addr)
            lib.dc_set_config(ac._dc_context, b"configured_addr", addr.encode("ascii"))
            ac.set_config("mail_pw", "123")
            lib.dc_set_config(ac._dc_context, b"configured_mail_pw", b"123")
            lib.dc_set_config(ac._dc_context, b"configured", b"1")
            return ac

-        def peek_online_config(self):
+        def get_online_config(self, pre_generated_key=True):
            if not session_liveconfig:
-                pytest.skip("specify DCC_PY_LIVECONFIG or --liveconfig")
-            return session_liveconfig.get(self.live_count)
-
-        def get_online_config(self):
-            if not session_liveconfig:
-                pytest.skip("specify DCC_PY_LIVECONFIG or --liveconfig")
+                pytest.skip("specify DCC_NEW_TMP_EMAIL or --liveconfig")
            configdict = session_liveconfig.get(self.live_count)
            self.live_count += 1
            if "e2ee_enabled" not in configdict:
@@ -170,18 +206,23 @@ def acfactory(pytestconfig, tmpdir, request, session_liveconfig):

            tmpdb = tmpdir.join("livedb%d" % self.live_count)
            ac = self.make_account(tmpdb.strpath, logid="ac{}".format(self.live_count))
+            if pre_generated_key:
+                self._preconfigure_key(ac, configdict['addr'])
            ac._evlogger.init_time = self.init_time
            ac._evlogger.set_timeout(30)
            return ac, dict(configdict)

-        def get_online_configuring_account(self, mvbox=False, sentbox=False):
-            ac, configdict = self.get_online_config()
+        def get_online_configuring_account(self, mvbox=False, sentbox=False,
+                                           pre_generated_key=True):
+            ac, configdict = self.get_online_config(
+                pre_generated_key=pre_generated_key)
            ac.configure(**configdict)
            ac.start_threads(mvbox=mvbox, sentbox=sentbox)
            return ac

-        def get_one_online_account(self):
-            ac1 = self.get_online_configuring_account()
+        def get_one_online_account(self, pre_generated_key=True):
+            ac1 = self.get_online_configuring_account(
+                pre_generated_key=pre_generated_key)
            wait_successful_IMAP_SMTP_connection(ac1)
            wait_configuration_progress(ac1, 1000)
            return ac1
@@ -195,10 +236,12 @@ def acfactory(pytestconfig, tmpdir, request, session_liveconfig):
            wait_configuration_progress(ac2, 1000)
            return ac1, ac2

-        def clone_online_account(self, account):
+        def clone_online_account(self, account, pre_generated_key=True):
            self.live_count += 1
            tmpdb = tmpdir.join("livedb%d" % self.live_count)
            ac = self.make_account(tmpdb.strpath, logid="ac{}".format(self.live_count))
+            if pre_generated_key:
+                self._preconfigure_key(ac, account.get_config("addr"))
            ac._evlogger.init_time = self.init_time
            ac._evlogger.set_timeout(30)
            ac.configure(addr=account.get_config("addr"), mail_pw=account.get_config("mail_pw"))
--- a/python/tests/data/d.png
+++ b/python/tests/data/d.png
--- a/python/tests/test_account.py
+++ b/python/tests/test_account.py
@@ -6,7 +6,8 @@ import time
 from deltachat import const, Account
 from deltachat.message import Message
 from datetime import datetime, timedelta
-from conftest import wait_configuration_progress, wait_successful_IMAP_SMTP_connection, wait_securejoin_inviter_progress
+from conftest import (wait_configuration_progress,
+                      wait_securejoin_inviter_progress)


 class TestOfflineAccountBasic:
@@ -16,6 +17,20 @@ class TestOfflineAccountBasic:
        with pytest.raises(ValueError):
            Account(p.strpath)

+    def test_os_name(self, tmpdir):
+        p = tmpdir.join("hello.db")
+        # we can't easily test if os_name is used in X-Mailer
+        # outgoing messages without a full Online test
+        # but we at least check Account accepts the arg
+        ac1 = Account(p.strpath, os_name="solarpunk")
+        ac1.get_info()
+
+    def test_preconfigure_keypair(self, acfactory, datadir):
+        ac = acfactory.get_unconfigured_account()
+        ac._preconfigure_keypair("alice@example.com",
+                                 datadir.join("key/alice-public.asc").read(),
+                                 datadir.join("key/alice-secret.asc").read())
+
    def test_getinfo(self, acfactory):
        ac1 = acfactory.get_unconfigured_account()
        d = ac1.get_info()
@@ -155,6 +170,18 @@ class TestOfflineChat:
        chat.set_name("title2")
        assert chat.get_name() == "title2"

+        d = chat.get_summary()
+        print(d)
+        assert d["id"] == chat.id
+        assert d["type"] == chat.get_type()
+        assert d["name"] == chat.get_name()
+        assert d["archived"] == chat.is_archived()
+        # assert d["param"] == chat.param
+        assert d["color"] == chat.get_color()
+        assert d["profile_image"] == "" if chat.get_profile_image() is None else chat.get_profile_image()
+        assert d["subtitle"] == chat.get_subtitle()
+        assert d["draft"] == "" if chat.get_draft() is None else chat.get_draft()
+
    def test_group_chat_creation_with_translation(self, ac1):
        ac1.set_stock_translation(const.DC_STR_NEWGROUPDRAFT, "xyz %1$s")
        ac1._evlogger.consume_events()
@@ -192,6 +219,18 @@ class TestOfflineChat:
        chat.remove_profile_image()
        assert chat.get_profile_image() is None

+    def test_mute(self, ac1):
+        chat = ac1.create_group_chat(name="title1")
+        assert not chat.is_muted()
+        chat.mute()
+        assert chat.is_muted()
+        chat.unmute()
+        assert not chat.is_muted()
+        chat.mute(50)
+        assert chat.is_muted()
+        with pytest.raises(ValueError):
+            chat.mute(-51)
+
    def test_delete_and_send_fails(self, ac1, chat1):
        chat1.delete()
        ac1._evlogger.get_matching("DC_EVENT_MSGS_CHANGED")
@@ -370,8 +409,31 @@ class TestOfflineChat:
        assert not res.is_ask_verifygroup()
        assert res.contact_id == 10

+    def test_group_chat_many_members_add_remove(self, ac1, lp):
+        lp.sec("ac1: creating group chat with 10 other members")
+        chat = ac1.create_group_chat(name="title1")
+        contacts = []
+        for i in range(10):
+            contact = ac1.create_contact("some{}@example.org".format(i))
+            contacts.append(contact)
+            chat.add_contact(contact)
+
+        num_contacts = len(chat.get_contacts())
+        assert num_contacts == 11
+
+        lp.sec("ac1: removing two contacts and checking things are right")
+        chat.remove_contact(contacts[9])
+        chat.remove_contact(contacts[3])
+        assert len(chat.get_contacts()) == 9
+

 class TestOnlineAccount:
+    @pytest.mark.ignored
+    def test_configure_generate_key(self, acfactory):
+        # A slow test which will generate a new key.
+        ac = acfactory.get_one_online_account(pre_generated_key=False)
+        ac.check_is_configured()
+
    def get_chat(self, ac1, ac2, both_created=False):
        c2 = ac1.create_contact(email=ac2.get_config("addr"))
        chat = ac1.create_chat_by_contact(c2)
@@ -398,37 +460,109 @@ class TestOnlineAccount:

    def test_one_account_send_bcc_setting(self, acfactory, lp):
        ac1 = acfactory.get_online_configuring_account()
-        ac2_config = acfactory.peek_online_config()
-        c2 = ac1.create_contact(email=ac2_config["addr"])
-        chat = ac1.create_chat_by_contact(c2)
-        assert chat.id > const.DC_CHAT_ID_LAST_SPECIAL
-        wait_successful_IMAP_SMTP_connection(ac1)
+        ac2 = acfactory.get_online_configuring_account()
+
+        # Clone the first account: we will test if sent messages
+        # are copied to it via BCC.
+        ac1_clone = acfactory.clone_online_account(ac1)
+
        wait_configuration_progress(ac1, 1000)
+        wait_configuration_progress(ac2, 1000)
+        wait_configuration_progress(ac1_clone, 1000)
+
+        chat = self.get_chat(ac1, ac2)
+
+        self_addr = ac1.get_config("addr")
+        other_addr = ac2.get_config("addr")
+
+        lp.sec("send out message without bcc to ourselves")
+        ac1.set_config("bcc_self", "0")
+        msg_out = chat.send_text("message1")
+        assert not msg_out.is_forwarded()
+
+        # wait for send out (no BCC)
+        ev = ac1._evlogger.get_matching("DC_EVENT_SMTP_MESSAGE_SENT")
+        assert ac1.get_config("bcc_self") == "0"
+
+        # make sure we are not sending message to ourselves
+        assert self_addr not in ev[2]
+        assert other_addr in ev[2]
+        ev = ac1._evlogger.get_matching("DC_EVENT_DELETED_BLOB_FILE")

        lp.sec("ac1: setting bcc_self=1")
        ac1.set_config("bcc_self", "1")

        lp.sec("send out message with bcc to ourselves")
        msg_out = chat.send_text("message2")
-        ev = ac1._evlogger.get_matching("DC_EVENT_MSGS_CHANGED")
-        assert ev[2] == msg_out.id
+
        # wait for send out (BCC)
-        assert ac1.get_config("bcc_self") == "1"
-        self_addr = ac1.get_config("addr")
        ev = ac1._evlogger.get_matching("DC_EVENT_SMTP_MESSAGE_SENT")
+        assert ac1.get_config("bcc_self") == "1"
+
+        # now make sure we are sending message to ourselves too
        assert self_addr in ev[2]
+        assert other_addr in ev[2]
        ev = ac1._evlogger.get_matching("DC_EVENT_DELETED_BLOB_FILE")

-        ac1._evlogger.consume_events()
-        lp.sec("send out message without bcc")
-        ac1.set_config("bcc_self", "0")
-        msg_out = chat.send_text("message3")
-        assert not msg_out.is_forwarded()
-        ev = ac1._evlogger.get_matching("DC_EVENT_MSGS_CHANGED")
-        assert ev[2] == msg_out.id
-        ev = ac1._evlogger.get_matching("DC_EVENT_SMTP_MESSAGE_SENT")
-        assert self_addr not in ev[2]
-        ev = ac1._evlogger.get_matching("DC_EVENT_DELETED_BLOB_FILE")
+        # Second client receives only second message, but not the first
+        ev = ac1_clone._evlogger.get_matching("DC_EVENT_MSGS_CHANGED")
+        assert ac1_clone.get_message_by_id(ev[2]).text == msg_out.text
+
+    def test_send_file_twice_unicode_filename_mangling(self, tmpdir, acfactory, lp):
+        ac1, ac2 = acfactory.get_two_online_accounts()
+        chat = self.get_chat(ac1, ac2)
+
+        basename = "somedäüta.html.zip"
+        p = os.path.join(tmpdir.strpath, basename)
+        with open(p, "w") as f:
+            f.write("some data")
+
+        def send_and_receive_message():
+            lp.sec("ac1: prepare and send attachment + text to ac2")
+            msg1 = Message.new_empty(ac1, "file")
+            msg1.set_text("withfile")
+            msg1.set_file(p)
+            chat.send_msg(msg1)
+
+            lp.sec("ac2: receive message")
+            ev = ac2._evlogger.get_matching("DC_EVENT_INCOMING_MSG|DC_EVENT_MSGS_CHANGED")
+            assert ev[2] > const.DC_CHAT_ID_LAST_SPECIAL
+            return ac2.get_message_by_id(ev[2])
+
+        msg = send_and_receive_message()
+        assert msg.text == "withfile"
+        assert open(msg.filename).read() == "some data"
+        assert msg.filename.endswith(basename)
+
+        msg2 = send_and_receive_message()
+        assert msg2.text == "withfile"
+        assert open(msg2.filename).read() == "some data"
+        assert msg2.filename.endswith("html.zip")
+        assert msg.filename != msg2.filename
+
+    def test_send_file_html_attachment(self, tmpdir, acfactory, lp):
+        ac1, ac2 = acfactory.get_two_online_accounts()
+        chat = self.get_chat(ac1, ac2)
+
+        basename = "test.html"
+        content = "<html><body>text</body>data"
+
+        p = os.path.join(tmpdir.strpath, basename)
+        with open(p, "w") as f:
+            # write wrong html to see if core tries to parse it
+            # (it shouldn't as it's a file attachment)
+            f.write(content)
+
+        lp.sec("ac1: prepare and send attachment + text to ac2")
+        chat.send_file(p, mime_type="text/html")
+
+        lp.sec("ac2: receive message")
+        ev = ac2._evlogger.get_matching("DC_EVENT_INCOMING_MSG|DC_EVENT_MSGS_CHANGED")
+        assert ev[2] > const.DC_CHAT_ID_LAST_SPECIAL
+        msg = ac2.get_message_by_id(ev[2])
+
+        assert open(msg.filename).read() == content
+        assert msg.filename.endswith(basename)

    def test_mvbox_sentbox_threads(self, acfactory, lp):
        lp.sec("ac1: start with mvbox thread")
@@ -475,27 +609,32 @@ class TestOnlineAccount:
        ac1._evlogger.get_matching("DC_EVENT_IMAP_MESSAGE_MOVED")
        ac1._evlogger.get_matching("DC_EVENT_IMAP_MESSAGE_MOVED")

-    def test_forward_messages(self, acfactory):
+    def test_forward_messages(self, acfactory, lp):
        ac1, ac2 = acfactory.get_two_online_accounts()
        chat = self.get_chat(ac1, ac2)

+        lp.sec("ac1: send message to ac2")
        msg_out = chat.send_text("message2")

-        # wait for other account to receive
+        lp.sec("ac2: wait for receive")
        ev = ac2._evlogger.get_matching("DC_EVENT_INCOMING_MSG|DC_EVENT_MSGS_CHANGED")
        assert ev[2] == msg_out.id
        msg_in = ac2.get_message_by_id(msg_out.id)
        assert msg_in.text == "message2"

-        # check the message arrived in contact-requests/deaddrop
+        lp.sec("ac2: check that the message arrive in deaddrop")
        chat2 = msg_in.chat
        assert msg_in in chat2.get_messages()
        assert not msg_in.is_forwarded()
        assert chat2.is_deaddrop()
        assert chat2 == ac2.get_deaddrop_chat()
+
+        lp.sec("ac2: create new chat and forward message to it")
        chat3 = ac2.create_group_chat("newgroup")
        assert not chat3.is_promoted()
        ac2.forward_messages([msg_in], chat3)
+
+        lp.sec("ac2: check new chat has a forwarded message")
        assert chat3.is_promoted()
        messages = chat3.get_messages()
        msg = messages[-1]
@@ -542,6 +681,9 @@ class TestOnlineAccount:
    def test_send_and_receive_message_markseen(self, acfactory, lp):
        ac1, ac2 = acfactory.get_two_online_accounts()

+        # make DC's life harder wrt to encodings
+        ac1.set_config("displayname", "ä name")
+
        lp.sec("ac1: create chat with ac2")
        chat = self.get_chat(ac1, ac2)

@@ -559,8 +701,9 @@ class TestOnlineAccount:
        msg_in = ac2.get_message_by_id(msg_out.id)
        assert msg_in.text == "message1"
        assert not msg_in.is_forwarded()
+        assert msg_in.get_sender_contact().display_name == ac1.get_config("displayname")

-        lp.sec("check the message arrived in contact-requets/deaddrop")
+        lp.sec("check the message arrived in contact-requests/deaddrop")
        chat2 = msg_in.chat
        assert msg_in in chat2.get_messages()
        assert chat2.is_deaddrop()
@@ -576,14 +719,26 @@ class TestOnlineAccount:
        chat2b.mark_noticed()
        assert chat2b.count_fresh_messages() == 0

-        lp.sec("mark message as seen on ac2, wait for changes on ac1")
-        ac2.mark_seen_messages([msg_in])
+        ac2._evlogger.consume_events()
+
+        lp.sec("sending a second message from ac1 to ac2")
+        msg_out2 = chat.send_text("message2")
+
+        lp.sec("wait for ac2 to receive second message")
+        ev = ac2._evlogger.get_matching("DC_EVENT_INCOMING_MSG")
+        assert ev[2] == msg_out2.id
+        msg_in2 = ac2.get_message_by_id(msg_out2.id)
+
+        lp.sec("mark messages as seen on ac2, wait for changes on ac1")
+        ac2.mark_seen_messages([msg_in, msg_in2])
        lp.step("1")
-        ev = ac1._evlogger.get_matching("DC_EVENT_MSG_READ")
-        assert ev[1] > const.DC_CHAT_ID_LAST_SPECIAL
-        assert ev[2] > const.DC_MSG_ID_LAST_SPECIAL
+        for i in range(2):
+            ev = ac1._evlogger.get_matching("DC_EVENT_MSG_READ")
+            assert ev[1] > const.DC_CHAT_ID_LAST_SPECIAL
+            assert ev[2] > const.DC_MSG_ID_LAST_SPECIAL
        lp.step("2")
        assert msg_out.is_out_mdn_received()
+        assert msg_out2.is_out_mdn_received()

        lp.sec("check that a second call to mark_seen does not create change or smtp job")
        ac2._evlogger.consume_events()
@@ -593,6 +748,41 @@ class TestOnlineAccount:
        except queue.Empty:
            pass  # mark_seen_messages() has generated events before it returns

+    def test_mdn_asymetric(self, acfactory, lp):
+        ac1, ac2 = acfactory.get_two_online_accounts()
+
+        lp.sec("ac1: create chat with ac2")
+        chat = self.get_chat(ac1, ac2, both_created=True)
+
+        # make sure mdns are enabled (usually enabled by default already)
+        ac1.set_config("mdns_enabled", "1")
+        ac2.set_config("mdns_enabled", "1")
+
+        lp.sec("sending text message from ac1 to ac2")
+        msg_out = chat.send_text("message1")
+
+        assert len(chat.get_messages()) == 1
+
+        lp.sec("disable ac1 MDNs")
+        ac1.set_config("mdns_enabled", "0")
+
+        lp.sec("wait for ac2 to receive message")
+        msg = ac2.wait_next_incoming_message()
+
+        assert len(msg.chat.get_messages()) == 1
+
+        lp.sec("ac2: mark incoming message as seen")
+        ac2.mark_seen_messages([msg])
+
+        lp.sec("ac1: waiting for incoming activity")
+        # MDN should be moved even though MDNs are already disabled
+        ac1._evlogger.get_matching("DC_EVENT_IMAP_MESSAGE_MOVED")
+
+        assert len(chat.get_messages()) == 1
+
+        # MDN is received even though MDNs are already disabled
+        assert msg_out.is_out_mdn_received()
+
    def test_send_and_receive_will_encrypt_decrypt(self, acfactory, lp):
        ac1, ac2 = acfactory.get_two_online_accounts()

@@ -621,6 +811,12 @@ class TestOnlineAccount:
        assert msg_back.text == "message-back"
        assert msg_back.is_encrypted()

+        # Test that we do not gossip peer keys in 1-to-1 chat,
+        # as it makes no sense to gossip to peers their own keys.
+        # Gossip is only sent in encrypted messages,
+        # and we sent encrypted msg_back right above.
+        assert chat2b.get_summary()["gossiped_timestamp"] == 0
+
        lp.sec("create group chat with two members, one of which has no encrypt state")
        chat = ac1.create_group_chat("encryption test")
        chat.add_contact(ac1.create_contact(ac2.get_config("addr")))
@@ -629,6 +825,85 @@ class TestOnlineAccount:
        ev = ac1._evlogger.get_matching("DC_EVENT_SMTP_MESSAGE_SENT")
        assert not msg.is_encrypted()

+    def test_send_first_message_as_long_unicode_with_cr(self, acfactory, lp):
+        ac1, ac2 = acfactory.get_two_online_accounts()
+        ac2.set_config("save_mime_headers", "1")
+
+        lp.sec("ac1: create chat with ac2")
+        chat = self.get_chat(ac1, ac2, both_created=True)
+
+        lp.sec("sending multi-line non-unicode message from ac1 to ac2")
+        text1 = "hello\nworld"
+        msg_out = chat.send_text(text1)
+        assert not msg_out.is_encrypted()
+
+        lp.sec("sending multi-line unicode text message from ac1 to ac2")
+        text2 = "äalis\nthis is ßßÄ"
+        msg_out = chat.send_text(text2)
+        assert not msg_out.is_encrypted()
+
+        lp.sec("wait for ac2 to receive multi-line non-unicode message")
+        msg_in = ac2.wait_next_incoming_message()
+        assert msg_in.text == text1
+
+        lp.sec("wait for ac2 to receive multi-line unicode message")
+        msg_in = ac2.wait_next_incoming_message()
+        assert msg_in.text == text2
+        assert ac1.get_config("addr") in msg_in.chat.get_name()
+
+    def test_reply_encrypted(self, acfactory, lp):
+        ac1, ac2 = acfactory.get_two_online_accounts()
+
+        lp.sec("ac1: create chat with ac2")
+        chat = self.get_chat(ac1, ac2)
+
+        lp.sec("sending text message from ac1 to ac2")
+        msg_out = chat.send_text("message1")
+        assert not msg_out.is_encrypted()
+
+        lp.sec("wait for ac2 to receive message")
+        ev = ac2._evlogger.get_matching("DC_EVENT_MSGS_CHANGED")
+        msg_in = ac2.get_message_by_id(msg_out.id)
+        assert msg_in.text == "message1"
+        assert not msg_in.is_encrypted()
+
+        lp.sec("create new chat with contact and send back (encrypted) message")
+        chat2b = ac2.create_chat_by_message(msg_in)
+        chat2b.send_text("message-back")
+
+        lp.sec("wait for ac1 to receive message")
+        ev = ac1._evlogger.get_matching("DC_EVENT_INCOMING_MSG")
+        assert ev[1] == chat.id
+        msg_back = ac1.get_message_by_id(ev[2])
+        assert msg_back.text == "message-back"
+        assert msg_back.is_encrypted()
+
+        lp.sec("ac1: e2ee_enabled=0 and see if reply is encrypted")
+        print("ac1: e2ee_enabled={}".format(ac1.get_config("e2ee_enabled")))
+        print("ac2: e2ee_enabled={}".format(ac2.get_config("e2ee_enabled")))
+        ac1.set_config("e2ee_enabled", "0")
+
+        # Set unprepared and unencrypted draft to test that it is not
+        # taken into account when determining whether last message is
+        # encrypted.
+        msg_draft = Message.new_empty(ac1, "text")
+        msg_draft.set_text("message2 -- should be encrypted")
+        chat.set_draft(msg_draft)
+
+        # Get the draft, prepare and send it.
+        msg_draft = chat.get_draft()
+        msg_out = chat.prepare_message(msg_draft)
+        chat.send_prepared(msg_out)
+
+        chat.set_draft(None)
+        assert chat.get_draft() is None
+
+        lp.sec("wait for ac2 to receive message")
+        ev = ac2._evlogger.get_matching("DC_EVENT_INCOMING_MSG")
+        msg_in = ac2.get_message_by_id(ev[2])
+        assert msg_in.text == "message2 -- should be encrypted"
+        assert msg_in.is_encrypted()
+
    def test_saved_mime_on_received_message(self, acfactory, lp):
        ac1, ac2 = acfactory.get_two_online_accounts()

@@ -817,7 +1092,54 @@ class TestOnlineAccount:
        assert msg.text == "world"
        assert msg.is_encrypted()

-    def test_set_get_profile_image(self, acfactory, data, lp):
+    def test_set_get_contact_avatar(self, acfactory, data, lp):
+        lp.sec("configuring ac1 and ac2")
+        ac1, ac2 = acfactory.get_two_online_accounts()
+
+        lp.sec("ac1: set own profile image")
+        p = data.get_path("d.png")
+        ac1.set_avatar(p)
+
+        lp.sec("ac1: create 1:1 chat with ac2")
+        chat = self.get_chat(ac1, ac2, both_created=True)
+
+        msg = chat.send_text("hi -- do you see my brand new avatar?")
+        assert not msg.is_encrypted()
+
+        lp.sec("ac2: wait for receiving message and avatar from ac1")
+        msg1 = ac2.wait_next_incoming_message()
+        assert not msg1.chat.is_deaddrop()
+        received_path = msg1.get_sender_contact().get_profile_image()
+        assert open(received_path, "rb").read() == open(p, "rb").read()
+
+        lp.sec("ac2: set own profile image")
+        p = data.get_path("d.png")
+        ac2.set_avatar(p)
+
+        lp.sec("ac2: send back message")
+        m = msg1.chat.send_text("yes, i received your avatar -- how do you like mine?")
+        assert m.is_encrypted()
+
+        lp.sec("ac1: wait for receiving message and avatar from ac2")
+        msg2 = ac1.wait_next_incoming_message()
+        received_path = msg2.get_sender_contact().get_profile_image()
+        assert received_path is not None, "did not get avatar through encrypted message"
+        assert open(received_path, "rb").read() == open(p, "rb").read()
+
+        ac2._evlogger.consume_events()
+        ac1._evlogger.consume_events()
+
+        # XXX not sure if the following is correct / possible. you may remove it
+        lp.sec("ac1: delete profile image from chat, and send message to ac2")
+        ac1.set_avatar(None)
+        m = msg2.chat.send_text("i don't like my avatar anymore and removed it")
+        assert m.is_encrypted()
+
+        lp.sec("ac2: wait for message along with avatar deletion of ac1")
+        msg3 = ac2.wait_next_incoming_message()
+        assert msg3.get_sender_contact().get_profile_image() is None
+
+    def test_set_get_group_image(self, acfactory, data, lp):
        ac1, ac2 = acfactory.get_two_online_accounts()

        lp.sec("create unpromoted group chat")
@@ -919,6 +1241,104 @@ class TestOnlineAccount:
        assert not locations3


+class TestGroupStressTests:
+    def test_group_many_members_add_leave_remove(self, acfactory, lp):
+        lp.sec("creating and configuring five accounts")
+        accounts = [acfactory.get_online_configuring_account() for i in range(5)]
+        for acc in accounts:
+            wait_configuration_progress(acc, 1000)
+        ac1 = accounts.pop()
+
+        lp.sec("ac1: setting up contacts with 4 other members")
+        contacts = []
+        for acc, name in zip(accounts, list("äöüsr")):
+            contact = ac1.create_contact(acc.get_config("addr"), name=name)
+            contacts.append(contact)
+
+            # make sure we accept the "hi" message
+            ac1.create_chat_by_contact(contact)
+
+            # make sure the other side accepts our messages
+            c1 = acc.create_contact(ac1.get_config("addr"), "ä member")
+            chat1 = acc.create_chat_by_contact(c1)
+
+            # send a message to get the contact key via autocrypt header
+            chat1.send_text("hi")
+            msg = ac1.wait_next_incoming_message()
+            assert msg.text == "hi"
+
+        # Save fifth account for later
+        ac5 = accounts.pop()
+        contact5 = contacts.pop()
+
+        lp.sec("ac1: creating group chat with 3 other members")
+        chat = ac1.create_group_chat("title1")
+        for contact in contacts:
+            chat.add_contact(contact)
+        assert not chat.is_promoted()
+
+        lp.sec("ac1: send mesage to new group chat")
+        msg = chat.send_text("hello")
+        assert chat.is_promoted()
+        assert msg.is_encrypted()
+
+        gossiped_timestamp = chat.get_summary()["gossiped_timestamp"]
+        assert gossiped_timestamp > 0
+
+        num_contacts = len(chat.get_contacts())
+        assert num_contacts == 3 + 1
+
+        lp.sec("ac2: checking that the chat arrived correctly")
+        ac2 = accounts[0]
+        msg = ac2.wait_next_incoming_message()
+        assert msg.text == "hello"
+        print("chat is", msg.chat)
+        assert len(msg.chat.get_contacts()) == 4
+
+        lp.sec("ac3: checking that 'ac4' is a known contact")
+        ac3 = accounts[1]
+        msg3 = ac3.wait_next_incoming_message()
+        assert msg3.text == "hello"
+        ac3_contacts = ac3.get_contacts()
+        assert len(ac3_contacts) == 3
+        ac4_contacts = ac3.get_contacts(query=accounts[2].get_config("addr"))
+        assert len(ac4_contacts) == 1
+
+        lp.sec("ac2: removing one contact")
+        to_remove = contacts[-1]
+        msg.chat.remove_contact(to_remove)
+
+        lp.sec("ac1: receiving system message about contact removal")
+        sysmsg = ac1.wait_next_incoming_message()
+        assert to_remove.addr in sysmsg.text
+        assert len(sysmsg.chat.get_contacts()) == 3
+
+        # Receiving message about removed contact does not reset gossip
+        assert chat.get_summary()["gossiped_timestamp"] == gossiped_timestamp
+
+        lp.sec("ac1: sending another message to the chat")
+        chat.send_text("hello2")
+        msg = ac2.wait_next_incoming_message()
+        assert msg.text == "hello2"
+        assert chat.get_summary()["gossiped_timestamp"] == gossiped_timestamp
+
+        lp.sec("ac1: adding fifth member to the chat")
+        chat.add_contact(contact5)
+        # Additng contact to chat resets gossiped_timestamp
+        assert chat.get_summary()["gossiped_timestamp"] >= gossiped_timestamp
+
+        lp.sec("ac2: receiving system message about contact addition")
+        sysmsg = ac2.wait_next_incoming_message()
+        assert contact5.addr in sysmsg.text
+        assert len(sysmsg.chat.get_contacts()) == 4
+
+        lp.sec("ac5: waiting for message about addition to the chat")
+        sysmsg = ac5.wait_next_incoming_message()
+        msg = sysmsg.chat.send_text("hello!")
+        # Message should be encrypted because keys of other members are gossiped
+        assert msg.is_encrypted()
+
+
 class TestOnlineConfigureFails:
    def test_invalid_password(self, acfactory):
        ac1, configdict = acfactory.get_online_config()
--- a/python/tests/test_increation.py
+++ b/python/tests/test_increation.py
@@ -1,10 +1,49 @@
 from __future__ import print_function
+
+import os.path
+import shutil
+
+import pytest
 from filecmp import cmp
-from deltachat import const
+
 from conftest import wait_configuration_progress, wait_msgs_changed
+from deltachat import const


 class TestOnlineInCreation:
+    def test_increation_not_blobdir(self, tmpdir, acfactory, lp):
+        ac1 = acfactory.get_online_configuring_account()
+        ac2 = acfactory.get_online_configuring_account()
+        wait_configuration_progress(ac1, 1000)
+        wait_configuration_progress(ac2, 1000)
+
+        c2 = ac1.create_contact(email=ac2.get_config("addr"))
+        chat = ac1.create_chat_by_contact(c2)
+
+        lp.sec("Creating in-creation file outside of blobdir")
+        assert tmpdir.strpath != ac1.get_blobdir()
+        src = tmpdir.join('file.txt').ensure(file=1)
+        with pytest.raises(Exception):
+            chat.prepare_message_file(src.strpath)
+
+    def test_no_increation_copies_to_blobdir(self, tmpdir, acfactory, lp):
+        ac1 = acfactory.get_online_configuring_account()
+        ac2 = acfactory.get_online_configuring_account()
+        wait_configuration_progress(ac1, 1000)
+        wait_configuration_progress(ac2, 1000)
+
+        c2 = ac1.create_contact(email=ac2.get_config("addr"))
+        chat = ac1.create_chat_by_contact(c2)
+
+        lp.sec("Creating file outside of blobdir")
+        assert tmpdir.strpath != ac1.get_blobdir()
+        src = tmpdir.join('file.txt')
+        src.write("hello there\n")
+        chat.send_file(src.strpath)
+
+        blob_src = os.path.join(ac1.get_blobdir(), 'file.txt')
+        assert os.path.exists(blob_src), "file.txt not copied to blobdir"
+
    def test_forward_increation(self, acfactory, data, lp):
        ac1 = acfactory.get_online_configuring_account()
        ac2 = acfactory.get_online_configuring_account()
@@ -17,7 +56,10 @@ class TestOnlineInCreation:
        wait_msgs_changed(ac1, 0, 0)  # why no chat id?

        lp.sec("create a message with a file in creation")
-        path = data.get_path("d.png")
+        orig = data.get_path("d.png")
+        path = os.path.join(ac1.get_blobdir(), 'd.png')
+        with open(path, "x") as fp:
+            fp.write("preparing")
        prepared_original = chat.prepare_message_file(path)
        assert prepared_original.is_out_preparing()
        wait_msgs_changed(ac1, chat.id, prepared_original.id)
@@ -38,6 +80,7 @@ class TestOnlineInCreation:

        lp.sec("finish creating the file and send it")
        assert prepared_original.is_out_preparing()
+        shutil.copyfile(orig, path)
        chat.send_prepared(prepared_original)
        assert prepared_original.is_out_pending() or prepared_original.is_out_delivered()
        wait_msgs_changed(ac1, chat.id, prepared_original.id)
@@ -57,13 +100,13 @@ class TestOnlineInCreation:

        lp.sec("wait1 for original or forwarded messages to arrive")
        ev1 = ac2._evlogger.get_matching("DC_EVENT_MSGS_CHANGED")
-        assert ev1[1] >= const.DC_CHAT_ID_LAST_SPECIAL
+        assert ev1[1] > const.DC_CHAT_ID_LAST_SPECIAL
        received_original = ac2.get_message_by_id(ev1[2])
-        assert cmp(received_original.filename, path, False)
+        assert cmp(received_original.filename, orig, shallow=False)

        lp.sec("wait2 for original or forwarded messages to arrive")
        ev2 = ac2._evlogger.get_matching("DC_EVENT_MSGS_CHANGED")
-        assert ev2[1] >= const.DC_CHAT_ID_LAST_SPECIAL
+        assert ev2[1] > const.DC_CHAT_ID_LAST_SPECIAL
        assert ev2[1] != ev1[1]
        received_copy = ac2.get_message_by_id(ev2[2])
-        assert cmp(received_copy.filename, path, False)
+        assert cmp(received_copy.filename, orig, shallow=False)
--- a/python/tests/test_lowlevel.py
+++ b/python/tests/test_lowlevel.py
@@ -102,19 +102,12 @@ def test_get_special_message_id_returns_empty_message(acfactory):
        assert msg.id == 0


-def test_provider_info():
-    provider = lib.dc_provider_new_from_email(cutil.as_dc_charpointer("ex@example.com"))
-    assert cutil.from_dc_charpointer(
-        lib.dc_provider_get_overview_page(provider)
-    ) == "https://providers.delta.chat/example.com"
-    assert cutil.from_dc_charpointer(lib.dc_provider_get_name(provider)) == "Example"
-    assert cutil.from_dc_charpointer(lib.dc_provider_get_markdown(provider)) == "\n..."
-    assert cutil.from_dc_charpointer(lib.dc_provider_get_status_date(provider)) == "2018-09"
-    assert lib.dc_provider_get_status(provider) == const.DC_PROVIDER_STATUS_PREPARATION
-
-
 def test_provider_info_none():
-    assert lib.dc_provider_new_from_email(cutil.as_dc_charpointer("email@unexistent.no")) == ffi.NULL
+    ctx = ffi.gc(
+        lib.dc_context_new(lib.py_dc_callback, ffi.NULL, ffi.NULL),
+        lib.dc_context_unref,
+    )
+    assert lib.dc_provider_new_from_email(ctx, cutil.as_dc_charpointer("email@unexistent.no")) == ffi.NULL


 def test_get_info_closed():
--- a/python/tests/test_provider_info.py
+++ b/python/tests/test_provider_info.py
@@ -1,27 +0,0 @@
-import pytest
-
-from deltachat import const
-from deltachat import provider
-
-
-def test_provider_info_from_email():
-    example = provider.Provider.from_email("email@example.com")
-    assert example.overview_page == "https://providers.delta.chat/example.com"
-    assert example.name == "Example"
-    assert example.markdown == "\n..."
-    assert example.status_date == "2018-09"
-    assert example.status == const.DC_PROVIDER_STATUS_PREPARATION
-
-
-def test_provider_info_from_domain():
-    example = provider.Provider("example.com")
-    assert example.overview_page == "https://providers.delta.chat/example.com"
-    assert example.name == "Example"
-    assert example.markdown == "\n..."
-    assert example.status_date == "2018-09"
-    assert example.status == const.DC_PROVIDER_STATUS_PREPARATION
-
-
-def test_provider_info_none():
-    with pytest.raises(provider.ProviderNotFoundError):
-        provider.Provider.from_email("email@unexistent.no")
--- a/python/tox.ini
+++ b/python/tox.ini
@@ -7,12 +7,8 @@ envlist =

 [testenv]
 commands = 
-    # (some qr tests are pretty heavy in terms of send/received
-    # messages and async-imap's likely has concurrency problems, 
-    # eg https://github.com/async-email/async-imap/issues/4 )
-    pytest -n6 --reruns 3 --reruns-delay 5 -v -rsXx -k "not qr" {posargs:tests} 
-    pytest -n6 --reruns 5 --reruns-delay 5 -v -rsXx -k "qr" {posargs:tests} 
-    # python tests/package_wheels.py {toxworkdir}/wheelhouse
+    pytest -n6 --reruns 2 --reruns-delay 5 -v -rsXx --ignored {posargs:tests}
+    python tests/package_wheels.py {toxworkdir}/wheelhouse
 passenv = 
    TRAVIS 
    DCC_RS_DEV
@@ -36,7 +32,7 @@ commands =

 [testenv:lint]
 skipsdist = True
-usedevelop = True
+skip_install = True
 deps =
    flake8
    # pygments required by rst-lint
@@ -69,11 +65,11 @@ commands =


 [pytest]
-addopts = -v -rs 
-python_files = tests/test_*.py 
+addopts = -v -ra --strict-markers
+python_files = tests/test_*.py
 norecursedirs = .tox 
 xfail_strict=true
-timeout = 60 
+timeout = 90
 timeout_method = thread

 [flake8]
--- a/set_core_version.py
+++ b/set_core_version.py
@@ -33,6 +33,8 @@ def replace_toml_version(relpath, newversion):
 if __name__ == "__main__":

    if len(sys.argv) < 2:
+        for x in ("Cargo.toml", "deltachat-ffi/Cargo.toml"):
+            print("{}: {}".format(x, read_toml_version(x)))
        raise SystemExit("need argument: new version, example 1.0.0-beta.27")
    newversion = sys.argv[1]
    if newversion.count(".") < 2:
@@ -53,7 +55,9 @@ if __name__ == "__main__":
    replace_toml_version("Cargo.toml", newversion)
    replace_toml_version("deltachat-ffi/Cargo.toml", newversion)

-    subprocess.call(["cargo", "update", "-p", "deltachat"])
+    subprocess.call(["cargo", "check"])
+    subprocess.call(["git", "add", "-u"])
+    # subprocess.call(["cargo", "update", "-p", "deltachat"])

    print("after commit make sure to: ")
    print("")
--- a/spec.md
+++ b/spec.md
@@ -1,6 +1,6 @@
 # Chat-over-Email specification

-Version 0.19.0
+Version 0.20.0

 This document describes how emails can be used
 to implement typical messenger functions
@@ -153,8 +153,8 @@ The message-id MUST have the format `Gr.<group-id>.<unique data>`.
    Hello group - this group contains three members

 Messengers adding the member list in the form `Name <email-address>`
-MUST take care only to spread the names authorized by the contacts themselves.
-Otherwise, names as _Daddy_ or _Honey_ may be spread
+MUST take care only to distribute the names authorized by the contacts themselves.
+Otherwise, names as _Daddy_ or _Honey_ may be distributed
 (this issue is also true for normal MUAs, however,
 for more contact- and chat-centralized apps
 such situations happen more frequently).
@@ -248,11 +248,11 @@ and the message SHOULD appear as a message or action from the sender.
 A group MAY have a group-image.
 To change or set the group-image,
 the messenger MUST attach an image file to a message
-and MUST add the header `Chat-Group-Image`
+and MUST add the header `Chat-Group-Avatar`
 with the value set to the image name.

 To remove the group-image,
-the messenger MUST add the header `Chat-Group-Image: 0`.
+the messenger MUST add the header `Chat-Group-Avatar: 0`.

 The messenger SHOULD send an explicit mail for each group image change.
 The body of the message SHOULD contain
@@ -265,7 +265,7 @@ and the message SHOULD appear as a message or action from the sender.
    Chat-Version: 1.0
    Chat-Group-ID: 12345uvwxyZ
    Chat-Group-Name: Our Group
-    Chat-Group-Image: image.jpg
+    Chat-Group-Avatar: image.jpg
    Message-ID: Gr.12345uvwxyZ.0005@domain
    Subject: Chat: Our Group: Hello, ...
    Content-Type: multipart/mixed; boundary="==break=="
@@ -283,25 +283,25 @@ and the message SHOULD appear as a message or action from the sender.

 The image format SHOULD be image/jpeg or image/png.
 To save data, it is RECOMMENDED
-to add a `Chat-Group-Image` only on image changes.
+to add a `Chat-Group-Avatar` only on image changes.


 # Set profile image

-A user MAY have a profile-image that MAY be spread to his contacts.
+A user MAY have a profile-image that MAY be distributed to their contacts.
 To change or set the profile-image,
 the messenger MUST attach an image file to a message
-and MUST add the header `Chat-Profile-Image`
+and MUST add the header `Chat-User-Avatar`
 with the value set to the image name.

 To remove the profile-image,
-the messenger MUST add the header `Chat-Profile-Image: 0`.
+the messenger MUST add the header `Chat-User-Avatar: 0`.

-To spread the image,
+To distribute the image,
 the messenger MAY send the profile image
 together with the next mail to a given contact
 (to do this only once,
-the messenger has to keep a `profile_image_update_state` somewhere).
+the messenger has to keep a `user_avatar_update_state` somewhere).
 Alternatively, the messenger MAY send an explicit mail
 for each profile-image change to all contacts using a compatible messenger.
 The messenger SHOULD NOT send an explicit mail to normal MUAs.
@@ -309,7 +309,7 @@ The messenger SHOULD NOT send an explicit mail to normal MUAs.
    From: sender@domain
    To: rcpt@domain
    Chat-Version: 1.0
-    Chat-Profile-Image: photo.jpg
+    Chat-User-Avatar: photo.jpg
    Subject: Chat: Hello, ...
    Content-Type: multipart/mixed; boundary="==break=="

@@ -325,10 +325,10 @@ The messenger SHOULD NOT send an explicit mail to normal MUAs.
    --==break==--

 The image format SHOULD be image/jpeg or image/png.
-Note that `Chat-Profile-Image` may appear together with all other headers,
-eg. there may be a `Chat-Profile-Image` and a `Chat-Group-Image` header
+Note that `Chat-User-Avatar` may appear together with all other headers,
+eg. there may be a `Chat-User-Avatar` and a `Chat-Group-Avatar` header
 in the same message.
-To save data, it is RECOMMENDED to add a `Chat-Profile-Image` header
+To save data, it is RECOMMENDED to add a `Chat-User-Avatar` header
 only on image changes.


--- a/src/aheader.rs
+++ b/src/aheader.rs
@@ -6,10 +6,10 @@ use std::collections::BTreeMap;
 use std::str::FromStr;
 use std::{fmt, str};

-use crate::constants::*;
 use crate::contact::*;
 use crate::context::Context;
-use crate::key::*;
+use crate::headerdef::{HeaderDef, HeaderDefMap};
+use crate::key::{DcKey, SignedPublicKey};

 /// Possible values for encryption preference
 #[derive(PartialEq, Eq, Debug, Clone, Copy, FromPrimitive, ToPrimitive)]
@@ -52,13 +52,17 @@ impl str::FromStr for EncryptPreference {
 #[derive(Debug)]
 pub struct Aheader {
    pub addr: String,
-    pub public_key: Key,
+    pub public_key: SignedPublicKey,
    pub prefer_encrypt: EncryptPreference,
 }

 impl Aheader {
    /// Creates new autocrypt header
-    pub fn new(addr: String, public_key: Key, prefer_encrypt: EncryptPreference) -> Self {
+    pub fn new(
+        addr: String,
+        public_key: SignedPublicKey,
+        prefer_encrypt: EncryptPreference,
+    ) -> Self {
        Aheader {
            addr,
            public_key,
@@ -71,12 +75,9 @@ impl Aheader {
        wanted_from: &str,
        headers: &[mailparse::MailHeader<'_>],
    ) -> Option<Self> {
-        use mailparse::MailHeaderMap;
-
-        if let Ok(Some(value)) = headers.get_first_value("Autocrypt") {
+        if let Ok(Some(value)) = headers.get_header_value(HeaderDef::Autocrypt) {
            match Self::from_str(&value) {
                Ok(header) => {
-                    info!(context, "comparing {} - {}", header.addr, wanted_from);
                    if addr_cmp(&header.addr, wanted_from) {
                        return Some(header);
                    }
@@ -96,16 +97,25 @@ impl Aheader {

 impl fmt::Display for Aheader {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        // TODO replace 78 with enum /rtn
-        // adds a whitespace every 78 characters, this allows libEtPan to
-        // wrap the lines according to RFC 5322
+        write!(fmt, "addr={};", self.addr)?;
+        if self.prefer_encrypt == EncryptPreference::Mutual {
+            write!(fmt, " prefer-encrypt=mutual;")?;
+        }
+
+        // adds a whitespace every 78 characters, this allows
+        // email crate to wrap the lines according to RFC 5322
        // (which may insert a linebreak before every whitespace)
-        let keydata = self.public_key.to_base64(78);
-        write!(
-            fmt,
-            "addr={}; prefer-encrypt={}; keydata={}",
-            self.addr, self.prefer_encrypt, keydata
-        )
+        let keydata = self.public_key.to_base64().chars().enumerate().fold(
+            String::new(),
+            |mut res, (i, c)| {
+                if i % 78 == 78 - "keydata=".len() {
+                    res.push(' ')
+                }
+                res.push(c);
+                res
+            },
+        );
+        write!(fmt, " keydata={}", keydata)
    }
 }

@@ -134,30 +144,16 @@ impl str::FromStr for Aheader {
                return Err(());
            }
        };
-
-        let public_key = match attributes
+        let public_key: SignedPublicKey = attributes
            .remove("keydata")
-            .and_then(|raw| Key::from_base64(&raw, KeyType::Public))
-        {
-            Some(key) => {
-                if key.verify() {
-                    key
-                } else {
-                    return Err(());
-                }
-            }
-            None => {
-                return Err(());
-            }
-        };
+            .ok_or(())
+            .and_then(|raw| SignedPublicKey::from_base64(&raw).or(Err(())))
+            .and_then(|key| key.verify().and(Ok(key)).or(Err(())))?;

-        let prefer_encrypt = match attributes
+        let prefer_encrypt = attributes
            .remove("prefer-encrypt")
            .and_then(|raw| raw.parse().ok())
-        {
-            Some(pref) => pref,
-            None => EncryptPreference::NoPreference,
-        };
+            .unwrap_or_default();

        // Autocrypt-Level0: unknown attributes starting with an underscore can be safely ignored
        // Autocrypt-Level0: unknown attribute, treat the header as invalid
@@ -177,15 +173,13 @@ impl str::FromStr for Aheader {
 mod tests {
    use super::*;

-    fn rawkey() -> String {
-        "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".into()
-    }
+    const RAWKEY: &str = "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";

    #[test]
    fn test_from_str() {
        let h: Aheader = format!(
            "addr=me@mail.com; prefer-encrypt=mutual; keydata={}",
-            rawkey()
+            RAWKEY
        )
        .parse()
        .expect("failed to parse");
@@ -194,9 +188,22 @@ mod tests {
        assert_eq!(h.prefer_encrypt, EncryptPreference::Mutual);
    }

+    // EncryptPreference::Reset is an internal value, parser should never return it
+    #[test]
+    fn test_from_str_reset() {
+        let raw = format!(
+            "addr=reset@example.com; prefer-encrypt=reset; keydata={}",
+            RAWKEY
+        );
+        let h: Aheader = raw.parse().expect("failed to parse");
+
+        assert_eq!(h.addr, "reset@example.com");
+        assert_eq!(h.prefer_encrypt, EncryptPreference::NoPreference);
+    }
+
    #[test]
    fn test_from_str_non_critical() {
-        let raw = format!("addr=me@mail.com; _foo=one; _bar=two; keydata={}", rawkey());
+        let raw = format!("addr=me@mail.com; _foo=one; _bar=two; keydata={}", RAWKEY);
        let h: Aheader = raw.parse().expect("failed to parse");

        assert_eq!(h.addr, "me@mail.com");
@@ -207,33 +214,57 @@ mod tests {
    fn test_from_str_superflous_critical() {
        let raw = format!(
            "addr=me@mail.com; _foo=one; _bar=two; other=me; keydata={}",
-            rawkey()
+            RAWKEY
        );
        assert!(raw.parse::<Aheader>().is_err());
    }

    #[test]
    fn test_good_headers() {
-        let fixed_header = "addr=a@b.example.org; prefer-encrypt=mutual; keydata=xsBNBFzG3j0BCAC6iNhT8zydvCXi8LI/gFnkadMbfmSE/rTJskRRra/utGbLyDta/yTrJgWL7O3y/g 4HdDW/dN2z26Y6W13IMzx9gLInn1KQZChtqWAcr/ReUucXcymwcfg1mdkBGk3TSLeLihN6CJx8Wsv8 ig+kgAzte4f5rqEEAJVQ9WZHuti7UiYs6oRzqTo06CRe9owVXxzdMf0VDQtf7ZFm9dpzKKbhH7Lu88 80iiotQ9/yRCkDGp9fNThsrLdZiK6OIAcIBAqi2rI89aS1dAmnRbktQieCx5izzyYkR1KvVL3gTTll HOzfKVEC2asmtWu2e4se/+O4WMIS1eGrn7GeWVb0Vwc5ABEBAAHNETxhQEBiLmV4YW1wbGUuZGU+ws CJBBABCAAzAhkBBQJcxt5FAhsDBAsJCAcGFQgJCgsCAxYCARYhBI4xxYKBgH3ANh5cufaKrc9mtiML AAoJEPaKrc9mtiML938H/18F+3Wf9/JaAy/8hCO1v4S2PVBhxaKCokaNFtkfaMRne2l087LscCFPiF Nyb4mv6Z3YeK8Xpxlp2sI0ecvdiqLUOGfnxS6tQrj+83EjtIrZ/hXOk1h121QFWH9Zg2VNHtODXjAg dLDC0NWUrclR0ZOqEDQHeo0ibTILdokVfXFN25wakPmGaYJP2y729cb1ve7RzvIvwn+Dddfxo3ao72 rBfLi7l4NQ4S0KsY4cw+/6l5bRCKYCP77wZtvCwUvfVVosLdT43agtSiBI49+ayqvZ8OCvSJa61i+v 81brTiEy9GBod4eAp45Ibsuemkw+gon4ZOvUXHTjwFB+h63MrozOwE0EXMbePQEIAL/vauf1zK8JgC u3V+G+SOX0iWw5xUlCPX+ERpBbWfwu3uAqn4wYXD3JDE/fVAF668xiV4eTPtlSUd5h0mn+G7uXMMOt kb+20SoEt50f8zw8TrL9t+ZsV11GKZWJpCar5AhXWsn6EEi8I2hLL5vn55ZZmHuGgN4jjmkRl3ToKC LhaXwTBjCJem7N5EH7F75wErEITa55v4Lb4Nfca7vnvtYrI1OA446xa8gHra0SINelTD09/JM/Fw4s WVPBaRZmJK/Tnu79N23No9XBUubmFPv1pNexZsQclicnTpt/BEWhiun7d6lfGB63K1aoHRTR1pcrWv BuALuuz0gqar2zlI0AEQEAAcLAdgQYAQgAIAUCXMbeRQIbDBYhBI4xxYKBgH3ANh5cufaKrc9mtiML AAoJEPaKrc9mtiMLKSEIAIyLCRO2OyZ0IYRvRPpMn4p7E+7Pfcz/0mSkOy+1hshgJnqivXurm8zwGr wdMqeV4eslKR9H1RUdWGUQJNbtwmmjrt5DHpIhYHl5t3FpCBaGbV20Omo00Q38lBl9MtrmZkZw+ktE k6X+0xCKssMF+2MADkSOIufbR5HrDVB89VZOHCO9DeXvCUUAw2hyJiL/LHmLzJ40zYoTmb+F//f0k0 j+tRdbkefyRoCmwG7YGiT+2hnCdgcezswnzah5J3ZKlrg7jOGo1LxtbvNUzxNBbC6S/aNgwm6qxo7x egRhmEl5uZ16zwyj4qz+xkjGy25Of5mWfUDoNw7OT7sjUbHOOMc=";
+        let fixed_header = concat!(
+            "addr=a@b.example.org; prefer-encrypt=mutual; ",
+            "keydata=xsBNBFzG3j0BCAC6iNhT8zydvCXi8LI/gFnkadMbfmSE/rTJskRRra/utGbLyDta/yTrJg",
+            " WL7O3y/g4HdDW/dN2z26Y6W13IMzx9gLInn1KQZChtqWAcr/ReUucXcymwcfg1mdkBGk3TSLeLihN6",
+            " CJx8Wsv8ig+kgAzte4f5rqEEAJVQ9WZHuti7UiYs6oRzqTo06CRe9owVXxzdMf0VDQtf7ZFm9dpzKK",
+            " bhH7Lu8880iiotQ9/yRCkDGp9fNThsrLdZiK6OIAcIBAqi2rI89aS1dAmnRbktQieCx5izzyYkR1Kv",
+            " VL3gTTllHOzfKVEC2asmtWu2e4se/+O4WMIS1eGrn7GeWVb0Vwc5ABEBAAHNETxhQEBiLmV4YW1wbG",
+            " UuZGU+wsCJBBABCAAzAhkBBQJcxt5FAhsDBAsJCAcGFQgJCgsCAxYCARYhBI4xxYKBgH3ANh5cufaK",
+            " rc9mtiMLAAoJEPaKrc9mtiML938H/18F+3Wf9/JaAy/8hCO1v4S2PVBhxaKCokaNFtkfaMRne2l087",
+            " LscCFPiFNyb4mv6Z3YeK8Xpxlp2sI0ecvdiqLUOGfnxS6tQrj+83EjtIrZ/hXOk1h121QFWH9Zg2VN",
+            " HtODXjAgdLDC0NWUrclR0ZOqEDQHeo0ibTILdokVfXFN25wakPmGaYJP2y729cb1ve7RzvIvwn+Ddd",
+            " fxo3ao72rBfLi7l4NQ4S0KsY4cw+/6l5bRCKYCP77wZtvCwUvfVVosLdT43agtSiBI49+ayqvZ8OCv",
+            " SJa61i+v81brTiEy9GBod4eAp45Ibsuemkw+gon4ZOvUXHTjwFB+h63MrozOwE0EXMbePQEIAL/vau",
+            " f1zK8JgCu3V+G+SOX0iWw5xUlCPX+ERpBbWfwu3uAqn4wYXD3JDE/fVAF668xiV4eTPtlSUd5h0mn+",
+            " G7uXMMOtkb+20SoEt50f8zw8TrL9t+ZsV11GKZWJpCar5AhXWsn6EEi8I2hLL5vn55ZZmHuGgN4jjm",
+            " kRl3ToKCLhaXwTBjCJem7N5EH7F75wErEITa55v4Lb4Nfca7vnvtYrI1OA446xa8gHra0SINelTD09",
+            " /JM/Fw4sWVPBaRZmJK/Tnu79N23No9XBUubmFPv1pNexZsQclicnTpt/BEWhiun7d6lfGB63K1aoHR",
+            " TR1pcrWvBuALuuz0gqar2zlI0AEQEAAcLAdgQYAQgAIAUCXMbeRQIbDBYhBI4xxYKBgH3ANh5cufaK",
+            " rc9mtiMLAAoJEPaKrc9mtiMLKSEIAIyLCRO2OyZ0IYRvRPpMn4p7E+7Pfcz/0mSkOy+1hshgJnqivX",
+            " urm8zwGrwdMqeV4eslKR9H1RUdWGUQJNbtwmmjrt5DHpIhYHl5t3FpCBaGbV20Omo00Q38lBl9Mtrm",
+            " ZkZw+ktEk6X+0xCKssMF+2MADkSOIufbR5HrDVB89VZOHCO9DeXvCUUAw2hyJiL/LHmLzJ40zYoTmb",
+            " +F//f0k0j+tRdbkefyRoCmwG7YGiT+2hnCdgcezswnzah5J3ZKlrg7jOGo1LxtbvNUzxNBbC6S/aNg",
+            " wm6qxo7xegRhmEl5uZ16zwyj4qz+xkjGy25Of5mWfUDoNw7OT7sjUbHOOMc="
+        );

        let ah = Aheader::from_str(fixed_header).expect("failed to parse");
        assert_eq!(ah.addr, "a@b.example.org");
        assert_eq!(ah.prefer_encrypt, EncryptPreference::Mutual);
+        assert_eq!(format!("{}", ah), fixed_header);

        let rendered = ah.to_string();
        assert_eq!(rendered, fixed_header);

-        let ah = Aheader::from_str(&format!(" _foo; __FOO=BAR ;;; addr = a@b.example.org ;\r\n   prefer-encrypt = mutual ; keydata = {}", rawkey())).expect("failed to parse");
+        let ah = Aheader::from_str(&format!(" _foo; __FOO=BAR ;;; addr = a@b.example.org ;\r\n   prefer-encrypt = mutual ; keydata = {}", RAWKEY)).expect("failed to parse");
        assert_eq!(ah.addr, "a@b.example.org");
        assert_eq!(ah.prefer_encrypt, EncryptPreference::Mutual);

        Aheader::from_str(&format!(
            "addr=a@b.example.org; prefer-encrypt=ignoreUnknownValues; keydata={}",
-            rawkey()
+            RAWKEY
        ))
        .expect("failed to parse");

-        Aheader::from_str(&format!("addr=a@b.example.org; keydata={}", rawkey()))
+        Aheader::from_str(&format!("addr=a@b.example.org; keydata={}", RAWKEY))
            .expect("failed to parse");
    }

@@ -245,4 +276,30 @@ mod tests {
        assert!(Aheader::from_str(" ;;").is_err());
        assert!(Aheader::from_str("addr=a@t.de; unknwon=1; keydata=jau").is_err());
    }
+
+    #[test]
+    fn test_display_aheader() {
+        assert!(format!(
+            "{}",
+            Aheader::new(
+                "test@example.com".to_string(),
+                SignedPublicKey::from_base64(RAWKEY).unwrap(),
+                EncryptPreference::Mutual
+            )
+        )
+        .contains("prefer-encrypt=mutual;"));
+
+        // According to Autocrypt Level 1 specification,
+        // only "prefer-encrypt=mutual;" can be used.
+        // If the setting is nopreference, the whole attribute is omitted.
+        assert!(!format!(
+            "{}",
+            Aheader::new(
+                "test@example.com".to_string(),
+                SignedPublicKey::from_base64(RAWKEY).unwrap(),
+                EncryptPreference::NoPreference
+            )
+        )
+        .contains("prefer-encrypt"));
+    }
 }
--- a/src/blob.rs
+++ b/src/blob.rs
@@ -6,9 +6,13 @@ use std::fs;
 use std::io::Write;
 use std::path::{Path, PathBuf};

+use self::image::GenericImageView;
+use crate::constants::AVATAR_SIZE;
 use crate::context::Context;
 use crate::events::Event;

+extern crate image;
+
 /// Represents a file in the blob directory.
 ///
 /// The object has a name, which will always be valid UTF-8.  Having a
@@ -159,7 +163,7 @@ impl<'a> BlobObject<'a> {
    /// This merely delegates to the [BlobObject::create_and_copy] and
    /// the [BlobObject::from_path] methods.  See those for possible
    /// errors.
-    pub fn create_from_path(
+    pub fn new_from_path(
        context: &Context,
        src: impl AsRef<Path>,
    ) -> std::result::Result<BlobObject, BlobError> {
@@ -318,13 +322,12 @@ impl<'a> BlobObject<'a> {

        let clean = sanitize_filename::sanitize_with_options(name, opts);
        let mut iter = clean.splitn(2, '.');
-        let mut stem = iter.next().unwrap_or_default().to_string();
-        let mut ext = iter.next().unwrap_or_default().to_string();
-        stem.truncate(64);
-        ext.truncate(32);
-        match ext.len() {
-            0 => (stem, "".to_string()),
-            _ => (stem, format!(".{}", ext).to_lowercase()),
+        let stem: String = iter.next().unwrap_or_default().chars().take(64).collect();
+        let ext: String = iter.next().unwrap_or_default().chars().take(32).collect();
+        if ext.is_empty() {
+            (stem, "".to_string())
+        } else {
+            (stem, format!(".{}", ext).to_lowercase())
        }
    }

@@ -349,6 +352,31 @@ impl<'a> BlobObject<'a> {
        }
        true
    }
+
+    pub fn recode_to_avatar_size(&self, context: &Context) -> Result<(), BlobError> {
+        let blob_abs = self.to_abs_path();
+        let img = image::open(&blob_abs).map_err(|err| BlobError::RecodeFailure {
+            blobdir: context.get_blobdir().to_path_buf(),
+            blobname: blob_abs.to_str().unwrap_or_default().to_string(),
+            cause: err,
+            backtrace: failure::Backtrace::new(),
+        })?;
+
+        if img.width() <= AVATAR_SIZE && img.height() <= AVATAR_SIZE {
+            return Ok(());
+        }
+
+        let img = img.thumbnail(AVATAR_SIZE, AVATAR_SIZE);
+
+        img.save(&blob_abs).map_err(|err| BlobError::WriteFailure {
+            blobdir: context.get_blobdir().to_path_buf(),
+            blobname: blob_abs.to_str().unwrap_or_default().to_string(),
+            cause: err,
+            backtrace: failure::Backtrace::new(),
+        })?;
+
+        Ok(())
+    }
 }

 impl<'a> fmt::Display for BlobObject<'a> {
@@ -382,6 +410,13 @@ pub enum BlobError {
        cause: std::io::Error,
        backtrace: failure::Backtrace,
    },
+    RecodeFailure {
+        blobdir: PathBuf,
+        blobname: String,
+        #[cause]
+        cause: image::ImageError,
+        backtrace: failure::Backtrace,
+    },
    WrongBlobdir {
        blobdir: PathBuf,
        src: PathBuf,
@@ -429,6 +464,9 @@ impl fmt::Display for BlobError {
                blobname,
                blobdir.display(),
            ),
+            BlobError::RecodeFailure {
+                blobdir, blobname, ..
+            } => write!(f, "Failed to recode {} in {}", blobname, blobdir.display(),),
            BlobError::WrongBlobdir { blobdir, src, .. } => write!(
                f,
                "File path {} is not in blobdir {}",
@@ -483,23 +521,23 @@ mod tests {
    #[test]
    fn test_suffix() {
        let t = dummy_context();
-        let foo = BlobObject::create(&t.ctx, "foo.txt", b"hello").unwrap();
-        assert_eq!(foo.suffix(), Some("txt"));
-        let bar = BlobObject::create(&t.ctx, "bar", b"world").unwrap();
-        assert_eq!(bar.suffix(), None);
+        let blob = BlobObject::create(&t.ctx, "foo.txt", b"hello").unwrap();
+        assert_eq!(blob.suffix(), Some("txt"));
+        let blob = BlobObject::create(&t.ctx, "bar", b"world").unwrap();
+        assert_eq!(blob.suffix(), None);
    }

    #[test]
    fn test_create_dup() {
        let t = dummy_context();
        BlobObject::create(&t.ctx, "foo.txt", b"hello").unwrap();
-        let foo = t.ctx.get_blobdir().join("foo.txt");
-        assert!(foo.exists());
+        let foo_path = t.ctx.get_blobdir().join("foo.txt");
+        assert!(foo_path.exists());
        BlobObject::create(&t.ctx, "foo.txt", b"world").unwrap();
        for dirent in fs::read_dir(t.ctx.get_blobdir()).unwrap() {
            let fname = dirent.unwrap().file_name();
-            if fname == foo.file_name().unwrap() {
-                assert_eq!(fs::read(&foo).unwrap(), b"hello");
+            if fname == foo_path.file_name().unwrap() {
+                assert_eq!(fs::read(&foo_path).unwrap(), b"hello");
            } else {
                let name = fname.to_str().unwrap();
                assert!(name.starts_with("foo"));
@@ -512,13 +550,13 @@ mod tests {
    fn test_double_ext_preserved() {
        let t = dummy_context();
        BlobObject::create(&t.ctx, "foo.tar.gz", b"hello").unwrap();
-        let foo = t.ctx.get_blobdir().join("foo.tar.gz");
-        assert!(foo.exists());
+        let foo_path = t.ctx.get_blobdir().join("foo.tar.gz");
+        assert!(foo_path.exists());
        BlobObject::create(&t.ctx, "foo.tar.gz", b"world").unwrap();
        for dirent in fs::read_dir(t.ctx.get_blobdir()).unwrap() {
            let fname = dirent.unwrap().file_name();
-            if fname == foo.file_name().unwrap() {
-                assert_eq!(fs::read(&foo).unwrap(), b"hello");
+            if fname == foo_path.file_name().unwrap() {
+                assert_eq!(fs::read(&foo_path).unwrap(), b"hello");
            } else {
                let name = fname.to_str().unwrap();
                println!("{}", name);
@@ -559,14 +597,14 @@ mod tests {

        let src_ext = t.dir.path().join("external");
        fs::write(&src_ext, b"boo").unwrap();
-        let blob = BlobObject::create_from_path(&t.ctx, &src_ext).unwrap();
+        let blob = BlobObject::new_from_path(&t.ctx, &src_ext).unwrap();
        assert_eq!(blob.as_name(), "$BLOBDIR/external");
        let data = fs::read(blob.to_abs_path()).unwrap();
        assert_eq!(data, b"boo");

        let src_int = t.ctx.get_blobdir().join("internal");
        fs::write(&src_int, b"boo").unwrap();
-        let blob = BlobObject::create_from_path(&t.ctx, &src_int).unwrap();
+        let blob = BlobObject::new_from_path(&t.ctx, &src_int).unwrap();
        assert_eq!(blob.as_name(), "$BLOBDIR/internal");
        let data = fs::read(blob.to_abs_path()).unwrap();
        assert_eq!(data, b"boo");
@@ -576,7 +614,7 @@ mod tests {
        let t = dummy_context();
        let src_ext = t.dir.path().join("autocrypt-setup-message-4137848473.html");
        fs::write(&src_ext, b"boo").unwrap();
-        let blob = BlobObject::create_from_path(&t.ctx, &src_ext).unwrap();
+        let blob = BlobObject::new_from_path(&t.ctx, &src_ext).unwrap();
        assert_eq!(
            blob.as_name(),
            "$BLOBDIR/autocrypt-setup-message-4137848473.html"
@@ -592,4 +630,11 @@ mod tests {
        assert!(!BlobObject::is_acceptible_blob_name("foo\\bar"));
        assert!(!BlobObject::is_acceptible_blob_name("foo\x00bar"));
    }
+
+    #[test]
+    fn test_sanitise_name() {
+        let (_, ext) =
+            BlobObject::sanitise_name("Я ЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯЯ.txt");
+        assert_eq!(ext, ".txt");
+    }
 }
--- a/src/chat.rs
+++ b/src/chat.rs
--- a/src/chatlist.rs
+++ b/src/chatlist.rs
@@ -36,7 +36,7 @@ use crate::stock::StockMessage;
 #[derive(Debug)]
 pub struct Chatlist {
    /// Stores pairs of `chat_id, message_id`
-    ids: Vec<(u32, MsgId)>,
+    ids: Vec<(ChatId, MsgId)>,
 }

 impl Chatlist {
@@ -60,7 +60,7 @@ impl Chatlist {
    ///   or "Not now".
    ///   The UI can also offer a "Close" button that calls dc_marknoticed_contact() then.
    /// - DC_CHAT_ID_ARCHIVED_LINK (6) - this special chat is present if the user has
-    ///   archived _any_ chat using dc_archive_chat(). The UI should show a link as
+    ///   archived *any* chat using dc_archive_chat(). The UI should show a link as
    ///   "Show archived chats", if the user clicks this item, the UI should show a
    ///   list of all archived chats that can be created by this function hen using
    ///   the DC_GCL_ARCHIVED_ONLY flag.
@@ -71,7 +71,7 @@ impl Chatlist {
    /// The `listflags` is a combination of flags:
    /// - if the flag DC_GCL_ARCHIVED_ONLY is set, only archived chats are returned.
    ///   if DC_GCL_ARCHIVED_ONLY is not set, only unarchived chats are returned and
-    ///   the pseudo-chat DC_CHAT_ID_ARCHIVED_LINK is added if there are _any_ archived
+    ///   the pseudo-chat DC_CHAT_ID_ARCHIVED_LINK is added if there are *any* archived
    ///   chats
    /// - if the flag DC_GCL_NO_SPECIALS is set, deaddrop and archive link are not added
    ///   to the list (may be used eg. for selecting chats on forwarding, the flag is
@@ -91,7 +91,7 @@ impl Chatlist {
        let mut add_archived_link_item = false;

        let process_row = |row: &rusqlite::Row| {
-            let chat_id: u32 = row.get(0)?;
+            let chat_id: ChatId = row.get(0)?;
            let msg_id: MsgId = row.get(1).unwrap_or_default();
            Ok((chat_id, msg_id))
        };
@@ -162,6 +162,12 @@ impl Chatlist {
            let query = query.trim().to_string();
            ensure!(!query.is_empty(), "missing query");

+            // allow searching over special names that may change at any time
+            // when the ui calls set_stock_translation()
+            if let Err(err) = update_special_chat_names(context) {
+                warn!(context, "cannot update special chat names: {:?}", err)
+            }
+
            let str_like_cmd = format!("%{}%", query);
            context.sql.query_map(
                "SELECT c.id, m.id
@@ -205,7 +211,10 @@ impl Chatlist {
            )?;
            if 0 == listflags & DC_GCL_NO_SPECIALS {
                if let Some(last_deaddrop_fresh_msg_id) = get_last_deaddrop_fresh_msg(context) {
-                    ids.insert(0, (DC_CHAT_ID_DEADDROP, last_deaddrop_fresh_msg_id));
+                    ids.insert(
+                        0,
+                        (ChatId::new(DC_CHAT_ID_DEADDROP), last_deaddrop_fresh_msg_id),
+                    );
                }
                add_archived_link_item = true;
            }
@@ -214,9 +223,9 @@ impl Chatlist {

        if add_archived_link_item && dc_get_archived_cnt(context) > 0 {
            if ids.is_empty() && 0 != listflags & DC_GCL_ADD_ALLDONE_HINT {
-                ids.push((DC_CHAT_ID_ALLDONE_HINT, MsgId::new(0)));
+                ids.push((ChatId::new(DC_CHAT_ID_ALLDONE_HINT), MsgId::new(0)));
            }
-            ids.push((DC_CHAT_ID_ARCHIVED_LINK, MsgId::new(0)));
+            ids.push((ChatId::new(DC_CHAT_ID_ARCHIVED_LINK), MsgId::new(0)));
        }

        Ok(Chatlist { ids })
@@ -235,9 +244,9 @@ impl Chatlist {
    /// Get a single chat ID of a chatlist.
    ///
    /// To get the message object from the message ID, use dc_get_chat().
-    pub fn get_chat_id(&self, index: usize) -> u32 {
+    pub fn get_chat_id(&self, index: usize) -> ChatId {
        if index >= self.ids.len() {
-            return 0;
+            return ChatId::new(0);
        }
        self.ids[index].0
    }
@@ -301,7 +310,7 @@ impl Chatlist {
            None
        };

-        if chat.id == DC_CHAT_ID_ARCHIVED_LINK {
+        if chat.id.is_archived_link() {
            ret.text2 = None;
        } else if lastmsg.is_none() || lastmsg.as_ref().unwrap().from_id == DC_CONTACT_ID_UNDEFINED
        {
@@ -314,7 +323,7 @@ impl Chatlist {
    }
 }

-/// Get the number of archived chats
+/// Returns the number of archived chats
 pub fn dc_get_archived_cnt(context: &Context) -> u32 {
    context
        .sql
@@ -349,7 +358,6 @@ fn get_last_deaddrop_fresh_msg(context: &Context) -> Option<MsgId> {
 mod tests {
    use super::*;

-    use crate::chat;
    use crate::test_utils::*;

    #[test]
@@ -369,7 +377,7 @@ mod tests {
        // drafts are sorted to the top
        let mut msg = Message::new(Viewtype::Text);
        msg.set_text(Some("hello".to_string()));
-        set_draft(&t.ctx, chat_id2, Some(&mut msg));
+        chat_id2.set_draft(&t.ctx, Some(&mut msg));
        let chats = Chatlist::try_load(&t.ctx, 0, None, None).unwrap();
        assert_eq!(chats.get_chat_id(0), chat_id2);

@@ -380,8 +388,31 @@ mod tests {
        let chats = Chatlist::try_load(&t.ctx, DC_GCL_ARCHIVED_ONLY, None, None).unwrap();
        assert_eq!(chats.len(), 0);

-        chat::archive(&t.ctx, chat_id1, true).ok();
+        chat_id1.set_archived(&t.ctx, true).ok();
        let chats = Chatlist::try_load(&t.ctx, DC_GCL_ARCHIVED_ONLY, None, None).unwrap();
        assert_eq!(chats.len(), 1);
    }
+
+    #[test]
+    fn test_search_special_chat_names() {
+        let t = dummy_context();
+        t.ctx.update_device_chats().unwrap();
+
+        let chats = Chatlist::try_load(&t.ctx, 0, Some("t-1234-s"), None).unwrap();
+        assert_eq!(chats.len(), 0);
+        let chats = Chatlist::try_load(&t.ctx, 0, Some("t-5678-b"), None).unwrap();
+        assert_eq!(chats.len(), 0);
+
+        t.ctx
+            .set_stock_translation(StockMessage::SavedMessages, "test-1234-save".to_string())
+            .unwrap();
+        let chats = Chatlist::try_load(&t.ctx, 0, Some("t-1234-s"), None).unwrap();
+        assert_eq!(chats.len(), 1);
+
+        t.ctx
+            .set_stock_translation(StockMessage::DeviceMessages, "test-5678-babbel".to_string())
+            .unwrap();
+        let chats = Chatlist::try_load(&t.ctx, 0, Some("t-5678-b"), None).unwrap();
+        assert_eq!(chats.len(), 1);
+    }
 }
--- a/src/config.rs
+++ b/src/config.rs
@@ -8,7 +8,9 @@ use crate::constants::DC_VERSION_STR;
 use crate::context::Context;
 use crate::dc_tools::*;
 use crate::job::*;
+use crate::mimefactory::RECOMMENDED_FILE_SIZE;
 use crate::stock::StockMessage;
+use rusqlite::NO_PARAMS;

 /// The available configuration keys.
 #[derive(
@@ -97,7 +99,7 @@ impl Context {
                rel_path.map(|p| dc_get_abs_path(self, &p).to_string_lossy().into_owned())
            }
            Config::SysVersion => Some((&*DC_VERSION_STR).clone()),
-            Config::SysMsgsizeMaxRecommended => Some(format!("{}", 24 * 1024 * 1024 / 4 * 3)),
+            Config::SysMsgsizeMaxRecommended => Some(format!("{}", RECOMMENDED_FILE_SIZE)),
            Config::SysConfigKeys => Some(get_config_keys_string()),
            _ => self.sql.get_raw_config(self, key),
        };
@@ -127,13 +129,23 @@ impl Context {
    /// If `None` is passed as a value the value is cleared and set to the default if there is one.
    pub fn set_config(&self, key: Config, value: Option<&str>) -> crate::sql::Result<()> {
        match key {
-            Config::Selfavatar if value.is_some() => {
-                let blob = BlobObject::create_from_path(&self, value.unwrap())?;
-                self.sql.set_raw_config(self, key, Some(blob.as_name()))
+            Config::Selfavatar => {
+                self.sql
+                    .execute("UPDATE contacts SET selfavatar_sent=0;", NO_PARAMS)?;
+                self.sql
+                    .set_raw_config_bool(self, "attach_selfavatar", true)?;
+                match value {
+                    Some(value) => {
+                        let blob = BlobObject::new_from_path(&self, value)?;
+                        blob.recode_to_avatar_size(self)?;
+                        self.sql.set_raw_config(self, key, Some(blob.as_name()))
+                    }
+                    None => self.sql.set_raw_config(self, key, None),
+                }
            }
            Config::InboxWatch => {
                let ret = self.sql.set_raw_config(self, key, value);
-                interrupt_inbox_idle(self, true);
+                interrupt_inbox_idle(self);
                ret
            }
            Config::SentboxWatch => {
@@ -179,7 +191,11 @@ mod tests {
    use std::str::FromStr;
    use std::string::ToString;

+    use crate::constants::AVATAR_SIZE;
    use crate::test_utils::*;
+    use image::GenericImageView;
+    use std::fs::File;
+    use std::io::Write;

    #[test]
    fn test_to_string() {
@@ -199,30 +215,55 @@ mod tests {
    }

    #[test]
-    fn test_selfavatar() -> failure::Fallible<()> {
+    fn test_selfavatar_outside_blobdir() {
        let t = dummy_context();
        let avatar_src = t.dir.path().join("avatar.jpg");
-        std::fs::write(&avatar_src, b"avatar")?;
+        let avatar_bytes = include_bytes!("../test-data/image/avatar1000x1000.jpg");
+        File::create(&avatar_src)
+            .unwrap()
+            .write_all(avatar_bytes)
+            .unwrap();
        let avatar_blob = t.ctx.get_blobdir().join("avatar.jpg");
        assert!(!avatar_blob.exists());
        t.ctx
-            .set_config(Config::Selfavatar, Some(&avatar_src.to_str().unwrap()))?;
+            .set_config(Config::Selfavatar, Some(&avatar_src.to_str().unwrap()))
+            .unwrap();
        assert!(avatar_blob.exists());
-        assert_eq!(std::fs::read(&avatar_blob)?, b"avatar");
+        assert!(std::fs::metadata(&avatar_blob).unwrap().len() < avatar_bytes.len() as u64);
        let avatar_cfg = t.ctx.get_config(Config::Selfavatar);
        assert_eq!(avatar_cfg, avatar_blob.to_str().map(|s| s.to_string()));
-        Ok(())
+
+        let img = image::open(avatar_src).unwrap();
+        assert_eq!(img.width(), 1000);
+        assert_eq!(img.height(), 1000);
+
+        let img = image::open(avatar_blob).unwrap();
+        assert_eq!(img.width(), AVATAR_SIZE);
+        assert_eq!(img.height(), AVATAR_SIZE);
    }

    #[test]
-    fn test_selfavatar_in_blobdir() -> failure::Fallible<()> {
+    fn test_selfavatar_in_blobdir() {
        let t = dummy_context();
-        let avatar_src = t.ctx.get_blobdir().join("avatar.jpg");
-        std::fs::write(&avatar_src, b"avatar")?;
+        let avatar_src = t.ctx.get_blobdir().join("avatar.png");
+        let avatar_bytes = include_bytes!("../test-data/image/avatar900x900.png");
+        File::create(&avatar_src)
+            .unwrap()
+            .write_all(avatar_bytes)
+            .unwrap();
+
+        let img = image::open(&avatar_src).unwrap();
+        assert_eq!(img.width(), 900);
+        assert_eq!(img.height(), 900);
+
        t.ctx
-            .set_config(Config::Selfavatar, Some(&avatar_src.to_str().unwrap()))?;
+            .set_config(Config::Selfavatar, Some(&avatar_src.to_str().unwrap()))
+            .unwrap();
        let avatar_cfg = t.ctx.get_config(Config::Selfavatar);
        assert_eq!(avatar_cfg, avatar_src.to_str().map(|s| s.to_string()));
-        Ok(())
+
+        let img = image::open(avatar_src).unwrap();
+        assert_eq!(img.width(), AVATAR_SIZE);
+        assert_eq!(img.height(), AVATAR_SIZE);
    }
 }
--- a/src/configure/auto_mozilla.rs
+++ b/src/configure/auto_mozilla.rs
@@ -1,8 +1,6 @@
 //! # Thunderbird's Autoconfiguration implementation
 //!
 //! Documentation: https://developer.mozilla.org/en-US/docs/Mozilla/Thunderbird/Autoconfiguration */
-use failure::Fail;
-
 use quick_xml;
 use quick_xml::events::{BytesEnd, BytesStart, BytesText};

@@ -74,7 +72,7 @@ fn parse_xml(in_emailaddr: &str, xml_raw: &str) -> Result<LoginParam> {
    // Split address into local part and domain part.
    let p = in_emailaddr
        .find('@')
-        .ok_or(Error::InvalidEmailAddress(in_emailaddr.to_string()))?;
+        .ok_or_else(|| Error::InvalidEmailAddress(in_emailaddr.to_string()))?;
    let (in_emaillocalpart, in_emaildomain) = in_emailaddr.split_at(p);
    let in_emaildomain = &in_emaildomain[1..];

@@ -130,13 +128,14 @@ pub fn moz_autoconfigure(
 ) -> Result<LoginParam> {
    let xml_raw = read_url(context, url)?;

-    parse_xml(&param_in.addr, &xml_raw).map_err(|err| {
+    let res = parse_xml(&param_in.addr, &xml_raw);
+    if let Err(err) = &res {
        warn!(
            context,
            "Failed to parse Thunderbird autoconfiguration XML: {}", err
        );
-        err.into()
-    })
+    }
+    res
 }

 fn moz_autoconfigure_text_cb<B: std::io::BufRead>(
--- a/src/configure/auto_outlook.rs
+++ b/src/configure/auto_outlook.rs
@@ -1,7 +1,5 @@
 //! Outlook's Autodiscover

-use failure::Fail;
-
 use quick_xml;
 use quick_xml::events::BytesEnd;

--- a/src/configure/mod.rs
+++ b/src/configure/mod.rs
@@ -6,16 +6,19 @@ mod read_url;

 use percent_encoding::{utf8_percent_encode, NON_ALPHANUMERIC};

+use async_std::task;
+
 use crate::config::Config;
 use crate::constants::*;
 use crate::context::Context;
 use crate::dc_tools::*;
-use crate::e2ee;
-use crate::job::*;
-use crate::login_param::LoginParam;
+use crate::job::{self, job_add, job_kill_action};
+use crate::login_param::{CertificateChecks, LoginParam};
 use crate::oauth2::*;
 use crate::param::Params;
+use crate::{chat, e2ee, provider};

+use crate::message::Message;
 use auto_mozilla::moz_autoconfigure;
 use auto_outlook::outlk_autodiscover;

@@ -35,8 +38,8 @@ pub fn configure(context: &Context) {
        warn!(context, "There is already another ongoing process running.",);
        return;
    }
-    job_kill_action(context, Action::ConfigureImap);
-    job_add(context, Action::ConfigureImap, 0, Params::new(), 0);
+    job_kill_action(context, job::Action::ConfigureImap);
+    job_add(context, job::Action::ConfigureImap, 0, Params::new(), 0);
 }

 /// Check if the context is already configured.
@@ -47,16 +50,16 @@ pub fn dc_is_configured(context: &Context) -> bool {
 /*******************************************************************************
 * Configure JOB
 ******************************************************************************/
-#[allow(non_snake_case, unused_must_use)]
-pub fn JobConfigureImap(context: &Context) {
+#[allow(non_snake_case, unused_must_use, clippy::cognitive_complexity)]
+pub fn JobConfigureImap(context: &Context) -> job::Status {
    if !context.sql.is_open() {
        error!(context, "Cannot configure, database not opened.",);
        progress!(context, 0);
-        return;
+        return job::Status::Finished(Err(format_err!("Database not opened")));
    }
    if !context.alloc_ongoing() {
        progress!(context, 0);
-        return;
+        return job::Status::Finished(Err(format_err!("Cannot allocated ongoing process")));
    }
    let mut success = false;
    let mut imap_connected_here = false;
@@ -92,9 +95,11 @@ pub fn JobConfigureImap(context: &Context) {
    let mut param_domain = "undefined.undefined".to_owned();
    let mut param_addr_urlencoded: String =
        "Internal Error: this value should never be used".to_owned();
-    let mut keep_flags = std::i32::MAX;
+    let mut keep_flags = 0;
+
+    const STEP_12_USE_AUTOCONFIG: u8 = 12;
+    const STEP_13_AFTER_AUTOCONFIG: u8 = 13;

-    const STEP_3_INDEX: u8 = 13;
    let mut step_counter: u8 = 0;
    while !context.shall_stop_ongoing() {
        step_counter += 1;
@@ -110,7 +115,7 @@ pub fn JobConfigureImap(context: &Context) {
            }
            // Step 1: Load the parameters and check email-address and password
            2 => {
-                if 0 != param.server_flags & 0x2 {
+                if 0 != param.server_flags & DC_LP_AUTH_OAUTH2 {
                    // the used oauth2 addr may differ, check this.
                    // if dc_get_oauth2_addr() is not available in the oauth2 implementation,
                    // just use the given one.
@@ -145,6 +150,7 @@ pub fn JobConfigureImap(context: &Context) {
            // Step 2: Autoconfig
            4 => {
                progress!(context, 200);
+
                if param.mail_server.is_empty()
                            && param.mail_port == 0
                            /*&&param.mail_user.is_empty() -- the user can enter a loginname which is used by autoconfig then */
@@ -152,12 +158,18 @@ pub fn JobConfigureImap(context: &Context) {
                            && param.send_port == 0
                            && param.send_user.is_empty()
                            /*&&param.send_pw.is_empty() -- the password cannot be auto-configured and is no criterion for autoconfig or not */
-                            && param.server_flags & !0x2 == 0
+                            && (param.server_flags & !DC_LP_AUTH_OAUTH2) == 0
                {
-                    keep_flags = param.server_flags & 0x2;
+                    // no advanced parameters entered by the user: query provider-database or do Autoconfig
+                    keep_flags = param.server_flags & DC_LP_AUTH_OAUTH2;
+                    if let Some(new_param) = get_offline_autoconfig(context, &param) {
+                        // got parameters from our provider-database, skip Autoconfig, preserve the OAuth2 setting
+                        param_autoconfig = Some(new_param);
+                        step_counter = STEP_12_USE_AUTOCONFIG - 1; // minus one as step_counter is increased on next loop
+                    }
                } else {
-                    // Autoconfig is not needed so skip it.
-                    step_counter = STEP_3_INDEX - 1;
+                    // advanced parameters entered by the user: skip Autoconfig
+                    step_counter = STEP_13_AFTER_AUTOCONFIG - 1; // minus one as step_counter is increased on next loop
                }
                true
            }
@@ -189,10 +201,7 @@ pub fn JobConfigureImap(context: &Context) {
            7 => {
                progress!(context, 310);
                if param_autoconfig.is_none() {
-                    let url = format!(
-                        "https://{}{}/autodiscover/autodiscover.xml",
-                        "", param_domain
-                    );
+                    let url = format!("https://{}/autodiscover/autodiscover.xml", param_domain);
                    param_autoconfig = outlk_autodiscover(context, &url, &param).ok();
                }
                true
@@ -242,8 +251,10 @@ pub fn JobConfigureImap(context: &Context) {
                }
                true
            }
-            /* C.  Do we have any result? */
-            12 => {
+            /* C.  Do we have any autoconfig result?
+               If you change the match-number here, also update STEP_12_COPY_AUTOCONFIG above
+            */
+            STEP_12_USE_AUTOCONFIG => {
                progress!(context, 500);
                if let Some(ref cfg) = param_autoconfig {
                    info!(context, "Got autoconfig: {}", &cfg);
@@ -256,15 +267,15 @@ pub fn JobConfigureImap(context: &Context) {
                    param.send_port = cfg.send_port;
                    param.send_user = cfg.send_user.clone();
                    param.server_flags = cfg.server_flags;
-                    /* although param_autoconfig's data are no longer needed from, it is important to keep the object as
-                    we may enter "deep guessing" if we could not read a configuration */
+                    /* although param_autoconfig's data are no longer needed from,
+                    it is used to later to prevent trying variations of port/server/logins */
                }
                param.server_flags |= keep_flags;
                true
            }
            // Step 3: Fill missing fields with defaults
-            13 => {
-                // if you move this, don't forget to update STEP_3_INDEX, too
+            // If you change the match-number here, also update STEP_13_AFTER_AUTOCONFIG above
+            STEP_13_AFTER_AUTOCONFIG => {
                if param.mail_server.is_empty() {
                    param.mail_server = format!("imap.{}", param_domain,)
                }
@@ -426,8 +437,77 @@ pub fn JobConfigureImap(context: &Context) {
        LoginParam::from_database(context, "configured_raw_").save_to_database(context, "");
    }

+    if let Some(provider) = provider::get_provider_info(&param.addr) {
+        if !provider.after_login_hint.is_empty() {
+            let mut msg = Message::new(Viewtype::Text);
+            msg.text = Some(provider.after_login_hint.to_string());
+            if chat::add_device_msg(context, Some("core-provider-info"), Some(&mut msg)).is_err() {
+                warn!(context, "cannot add after_login_hint as core-provider-info");
+            }
+        }
+    }
+
    context.free_ongoing();
    progress!(context, if success { 1000 } else { 0 });
+    job::Status::Finished(Ok(()))
+}
+
+#[allow(clippy::unnecessary_unwrap)]
+fn get_offline_autoconfig(context: &Context, param: &LoginParam) -> Option<LoginParam> {
+    info!(
+        context,
+        "checking internal provider-info for offline autoconfig"
+    );
+
+    if let Some(provider) = provider::get_provider_info(&param.addr) {
+        match provider.status {
+            provider::Status::OK | provider::Status::PREPARATION => {
+                let imap = provider.get_imap_server();
+                let smtp = provider.get_smtp_server();
+                // clippy complains about these is_some()/unwrap() settings,
+                // however, rewriting the code to "if let" would make things less obvious,
+                // esp. if we allow more combinations of servers (pop, jmap).
+                // therefore, #[allow(clippy::unnecessary_unwrap)] is added above.
+                if imap.is_some() && smtp.is_some() {
+                    let imap = imap.unwrap();
+                    let smtp = smtp.unwrap();
+
+                    let mut p = LoginParam::new();
+                    p.addr = param.addr.clone();
+
+                    p.mail_server = imap.hostname.to_string();
+                    p.mail_user = imap.apply_username_pattern(param.addr.clone());
+                    p.mail_port = imap.port as i32;
+                    p.imap_certificate_checks = CertificateChecks::AcceptInvalidCertificates;
+                    p.server_flags |= match imap.socket {
+                        provider::Socket::STARTTLS => DC_LP_IMAP_SOCKET_STARTTLS,
+                        provider::Socket::SSL => DC_LP_IMAP_SOCKET_SSL,
+                    };
+
+                    p.send_server = smtp.hostname.to_string();
+                    p.send_user = smtp.apply_username_pattern(param.addr.clone());
+                    p.send_port = smtp.port as i32;
+                    p.smtp_certificate_checks = CertificateChecks::AcceptInvalidCertificates;
+                    p.server_flags |= match smtp.socket {
+                        provider::Socket::STARTTLS => DC_LP_SMTP_SOCKET_STARTTLS as i32,
+                        provider::Socket::SSL => DC_LP_SMTP_SOCKET_SSL as i32,
+                    };
+
+                    info!(context, "offline autoconfig found: {}", p);
+                    return Some(p);
+                } else {
+                    info!(context, "offline autoconfig found, but no servers defined");
+                    return None;
+                }
+            }
+            provider::Status::BROKEN => {
+                info!(context, "offline autoconfig found, provider is broken");
+                return None;
+            }
+        }
+    }
+    info!(context, "no offline autoconfig found");
+    None
 }

 fn try_imap_connections(
@@ -485,17 +565,22 @@ fn try_imap_connection(

 fn try_imap_one_param(context: &Context, param: &LoginParam) -> Option<bool> {
    let inf = format!(
-        "imap: {}@{}:{} flags=0x{:x}",
-        param.mail_user, param.mail_server, param.mail_port, param.server_flags
+        "imap: {}@{}:{} flags=0x{:x} certificate_checks={}",
+        param.mail_user,
+        param.mail_server,
+        param.mail_port,
+        param.server_flags,
+        param.imap_certificate_checks
    );
    info!(context, "Trying: {}", inf);
-    if context
-        .inbox_thread
-        .read()
-        .unwrap()
-        .imap
-        .connect(context, &param)
-    {
+    if task::block_on(
+        context
+            .inbox_thread
+            .read()
+            .unwrap()
+            .imap
+            .connect(context, &param),
+    ) {
        info!(context, "success: {}", inf);
        return Some(true);
    }
@@ -567,6 +652,7 @@ fn try_smtp_one_param(context: &Context, param: &LoginParam) -> Option<bool> {
 #[cfg(test)]
 mod tests {

+    use super::*;
    use crate::config::*;
    use crate::configure::JobConfigureImap;
    use crate::test_utils::*;
@@ -580,4 +666,19 @@ mod tests {
        t.ctx.set_config(Config::MailPw, Some("123456")).unwrap();
        JobConfigureImap(&t.ctx);
    }
+
+    #[test]
+    fn test_get_offline_autoconfig() {
+        let context = dummy_context().ctx;
+
+        let mut params = LoginParam::new();
+        params.addr = "someone123@example.org".to_string();
+        assert!(get_offline_autoconfig(&context, &params).is_none());
+
+        let mut params = LoginParam::new();
+        params.addr = "someone123@nauta.cu".to_string();
+        let found_params = get_offline_autoconfig(&context, &params).unwrap();
+        assert_eq!(found_params.mail_server, "imap.nauta.cu".to_string());
+        assert_eq!(found_params.send_server, "smtp.nauta.cu".to_string());
+    }
 }
--- a/src/configure/read_url.rs
+++ b/src/configure/read_url.rs
@@ -1,5 +1,4 @@
 use crate::context::Context;
-use failure::Fail;

 #[derive(Debug, Fail)]
 pub enum Error {
@@ -12,10 +11,10 @@ pub type Result<T> = std::result::Result<T, Error>;
 pub fn read_url(context: &Context, url: &str) -> Result<String> {
    info!(context, "Requesting URL {}", url);

-    match reqwest::Client::new()
+    match reqwest::blocking::Client::new()
        .get(url)
        .send()
-        .and_then(|mut res| res.text())
+        .and_then(|res| res.text())
    {
        Ok(res) => Ok(res),
        Err(err) => {
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -1,5 +1,5 @@
 //! # Constants
-#![allow(non_camel_case_types, dead_code)]
+#![allow(dead_code)]

 use deltachat_derive::*;
 use lazy_static::lazy_static;
@@ -49,6 +49,8 @@ pub const DC_HANDSHAKE_CONTINUE_NORMAL_PROCESSING: i32 = 0x01;
 pub const DC_HANDSHAKE_STOP_NORMAL_PROCESSING: i32 = 0x02;
 pub const DC_HANDSHAKE_ADD_DELETE_JOB: i32 = 0x04;

+pub(crate) const DC_FROM_HANDSHAKE: i32 = 0x01;
+
 pub const DC_GCL_ARCHIVED_ONLY: usize = 0x01;
 pub const DC_GCL_NO_SPECIALS: usize = 0x02;
 pub const DC_GCL_ADD_ALLDONE_HINT: usize = 0x04;
@@ -58,9 +60,8 @@ pub const DC_GCM_ADDDAYMARKER: u32 = 0x01;
 pub const DC_GCL_VERIFIED_ONLY: usize = 0x01;
 pub const DC_GCL_ADD_SELF: usize = 0x02;

-// values for DC_PARAM_FORCE_PLAINTEXT
-pub(crate) const DC_FP_NO_AUTOCRYPT_HEADER: i32 = 2;
-pub(crate) const DC_FP_ADD_AUTOCRYPT_HEADER: i32 = 1;
+// unchanged user avatars are resent to the recipients every some days
+pub const DC_RESEND_USER_AVATAR_DAYS: i64 = 14;

 /// virtual chat showing all messages belonging to chats flagged with chats.blocked=2
 pub(crate) const DC_CHAT_ID_DEADDROP: u32 = 1;
@@ -111,7 +112,7 @@ pub const DC_MSG_ID_LAST_SPECIAL: u32 = 9;
 /// approx. max. length returned by dc_msg_get_text()
 const DC_MAX_GET_TEXT_LEN: usize = 30000;
 /// approx. max. length returned by dc_get_msg_info()
-const DC_MAX_GET_INFO_LEN: usize = 100000;
+const DC_MAX_GET_INFO_LEN: usize = 100_000;

 pub const DC_CONTACT_ID_UNDEFINED: u32 = 0;
 pub const DC_CONTACT_ID_SELF: u32 = 1;
@@ -119,6 +120,10 @@ pub const DC_CONTACT_ID_INFO: u32 = 2;
 pub const DC_CONTACT_ID_DEVICE: u32 = 5;
 pub const DC_CONTACT_ID_LAST_SPECIAL: u32 = 9;

+// decorative address that is used for DC_CONTACT_ID_DEVICE
+// when an api that returns an email is called.
+pub const DC_CONTACT_ID_DEVICE_ADDR: &str = "device@localhost";
+
 // Flags for empty server job

 pub const DC_EMPTY_MVBOX: u32 = 0x01;
@@ -177,10 +182,14 @@ pub const DC_VC_CONTACT_CONFIRM: i32 = 6;
 pub const DC_BOB_ERROR: i32 = 0;
 pub const DC_BOB_SUCCESS: i32 = 1;

+// max. width/height of an avatar
+pub const AVATAR_SIZE: u32 = 192;
+
 #[derive(Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql)]
 #[repr(i32)]
 pub enum Viewtype {
    Unknown = 0,
+
    /// Text message.
    /// The text of the message is set using dc_msg_set_text()
    /// and retrieved with dc_msg_get_text().
--- a/src/contact.rs
+++ b/src/contact.rs
@@ -1,3 +1,5 @@
+//! Contacts module
+
 use std::path::PathBuf;

 use deltachat_derive::*;
@@ -5,16 +7,19 @@ use itertools::Itertools;
 use rusqlite;

 use crate::aheader::EncryptPreference;
+use crate::chat::ChatId;
 use crate::config::Config;
 use crate::constants::*;
 use crate::context::Context;
 use crate::dc_tools::*;
 use crate::e2ee;
-use crate::error::Result;
+use crate::error::{Error, Result};
 use crate::events::Event;
 use crate::key::*;
 use crate::login_param::LoginParam;
 use crate::message::{MessageState, MsgId};
+use crate::mimeparser::AvatarAction;
+use crate::param::*;
 use crate::peerstate::*;
 use crate::sql;
 use crate::stock::StockMessage;
@@ -23,15 +28,17 @@ use crate::stock::StockMessage;
 const DC_ORIGIN_MIN_CONTACT_LIST: i32 = 0x100;

 /// An object representing a single contact in memory.
+///
 /// The contact object is not updated.
 /// If you want an update, you have to recreate the object.
 ///
 /// The library makes sure
 /// only to use names _authorized_ by the contact in `To:` or `Cc:`.
-/// _Given-names _as "Daddy" or "Honey" are not used there.
+/// *Given-names* as "Daddy" or "Honey" are not used there.
 /// For this purpose, internally, two names are tracked -
-/// authorized-name and given-name.
+/// authorized name and given name.
 /// By default, these names are equal, but functions working with contact names
+/// only affect the given name.
 #[derive(Debug)]
 pub struct Contact {
    /// The contact ID.
@@ -42,20 +49,28 @@ pub struct Contact {
    ///
    /// Normal contact IDs are larger than these special ones (larger than DC_CONTACT_ID_LAST_SPECIAL).
    pub id: u32,
+
    /// Contact name. It is recommended to use `Contact::get_name`,
    /// `Contact::get_display_name` or `Contact::get_name_n_addr` to access this field.
    /// May be empty, initially set to `authname`.
    name: String,
+
    /// Name authorized by the contact himself. Only this name may be spread to others,
    /// e.g. in To:-lists. May be empty. It is recommended to use `Contact::get_authname`,
    /// to access this field.
    authname: String,
+
    /// E-Mail-Address of the contact. It is recommended to use `Contact::get_addr`` to access this field.
    addr: String,
+
    /// Blocked state. Use dc_contact_is_blocked to access this field.
-    blocked: bool,
+    pub blocked: bool,
+
    /// The origin/source of the contact.
    pub origin: Origin,
+
+    /// Parameters as Param::ProfileImage
+    pub param: Params,
 }

 /// Possible origins of a contact.
@@ -65,38 +80,54 @@ pub struct Contact {
 #[repr(i32)]
 pub enum Origin {
    Unknown = 0,
+
    /// From: of incoming messages of unknown sender
    IncomingUnknownFrom = 0x10,
+
    /// Cc: of incoming messages of unknown sender
    IncomingUnknownCc = 0x20,
+
    /// To: of incoming messages of unknown sender
    IncomingUnknownTo = 0x40,
+
    /// address scanned but not verified
    UnhandledQrScan = 0x80,
+
    /// Reply-To: of incoming message of known sender
    IncomingReplyTo = 0x100,
+
    /// Cc: of incoming message of known sender
    IncomingCc = 0x200,
+
    /// additional To:'s of incoming message of known sender
    IncomingTo = 0x400,
+
    /// a chat was manually created for this user, but no message yet sent
    CreateChat = 0x800,
+
    /// message sent by us
    OutgoingBcc = 0x1000,
+
    /// message sent by us
    OutgoingCc = 0x2000,
+
    /// message sent by us
    OutgoingTo = 0x4000,
+
    /// internal use
    Internal = 0x40000,
+
    /// address is in our address book
    AdressBook = 0x80000,
+
    /// set on Alice's side for contacts like Bob that have scanned the QR code offered by her. Only means the contact has once been established using the "securejoin" procedure in the past, getting the current key verification status requires calling dc_contact_is_verified() !
-    SecurejoinInvited = 0x1000000,
+    SecurejoinInvited = 0x0100_0000,
+
    /// set on Bob's side for contacts scanned and verified from a QR code. Only means the contact has once been established using the "securejoin" procedure in the past, getting the current key verification status requires calling dc_contact_is_verified() !
-    SecurejoinJoined = 0x2000000,
-    /// contact added mannually by dc_create_contact(), this should be the largets origin as otherwise the user cannot modify the names
-    ManuallyCreated = 0x4000000,
+    SecurejoinJoined = 0x0200_0000,
+
+    /// contact added mannually by dc_create_contact(), this should be the largest origin as otherwise the user cannot modify the names
+    ManuallyCreated = 0x0400_0000,
 }

 impl Default for Origin {
@@ -106,19 +137,11 @@ impl Default for Origin {
 }

 impl Origin {
-    /// Contacts that start a new "normal" chat, defaults to off.
-    pub fn is_start_new_chat(self) -> bool {
-        self as i32 >= 0x7FFFFFFF
-    }
-
-    /// Contacts that are verified and known not to be spam.
-    pub fn is_verified(self) -> bool {
-        self as i32 >= 0x100
-    }
-
-    /// Contacts that are shown in the contact list.
-    pub fn include_in_contactlist(self) -> bool {
-        self as i32 >= DC_ORIGIN_MIN_CONTACT_LIST
+    /// Contacts that are known, i. e. they came in via accepted contacts or
+    /// themselves an accepted contact. Known contacts are shown in the
+    /// contact list when one creates a chat and wants to add members etc.
+    pub fn is_known(self) -> bool {
+        self >= Origin::IncomingReplyTo
    }
 }

@@ -142,32 +165,10 @@ pub enum VerifiedStatus {

 impl Contact {
    pub fn load_from_db(context: &Context, contact_id: u32) -> crate::sql::Result<Self> {
-        if contact_id == DC_CONTACT_ID_SELF {
-            let contact = Contact {
-                id: contact_id,
-                name: context.stock_str(StockMessage::SelfMsg).into(),
-                authname: "".into(),
-                addr: context
-                    .get_config(Config::ConfiguredAddr)
-                    .unwrap_or_default(),
-                blocked: false,
-                origin: Origin::Unknown,
-            };
-            return Ok(contact);
-        } else if contact_id == DC_CONTACT_ID_DEVICE {
-            let contact = Contact {
-                id: contact_id,
-                name: context.stock_str(StockMessage::DeviceMessages).into(),
-                authname: "".into(),
-                addr: "device@localhost".into(),
-                blocked: false,
-                origin: Origin::Unknown,
-            };
-            return Ok(contact);
-        }
-
-        context.sql.query_row(
-            "SELECT c.name, c.addr, c.origin, c.blocked, c.authname  FROM contacts c  WHERE c.id=?;",
+        let mut res = context.sql.query_row(
+            "SELECT c.name, c.addr, c.origin, c.blocked, c.authname, c.param
+               FROM contacts c
+              WHERE c.id=?;",
            params![contact_id as i32],
            |row| {
                let contact = Self {
@@ -177,10 +178,21 @@ impl Contact {
                    addr: row.get::<_, String>(1)?,
                    blocked: row.get::<_, Option<i32>>(3)?.unwrap_or_default() != 0,
                    origin: row.get(2)?,
+                    param: row.get::<_, String>(5)?.parse().unwrap_or_default(),
                };
                Ok(contact)
-            }
-        )
+            },
+        )?;
+        if contact_id == DC_CONTACT_ID_SELF {
+            res.name = context.stock_str(StockMessage::SelfMsg).to_string();
+            res.addr = context
+                .get_config(Config::ConfiguredAddr)
+                .unwrap_or_default();
+        } else if contact_id == DC_CONTACT_ID_DEVICE {
+            res.name = context.stock_str(StockMessage::DeviceMessages).to_string();
+            res.addr = DC_CONTACT_ID_DEVICE_ADDR.to_string();
+        }
+        Ok(res)
    }

    /// Returns `true` if this contact is blocked.
@@ -208,7 +220,7 @@ impl Contact {
    /// Add a single contact as a result of an _explicit_ user action.
    ///
    /// We assume, the contact name, if any, is entered by the user and is used "as is" therefore,
-    /// normalize() is _not_ called for the name. If the contact is blocked, it is unblocked.
+    /// normalize() is *not* called for the name. If the contact is blocked, it is unblocked.
    ///
    /// To add a number of contacts, see `dc_add_address_book()` which is much faster for adding
    /// a bunch of addresses.
@@ -238,7 +250,7 @@ impl Contact {
    }

    /// Mark all messages sent by the given contact
-    /// as _noticed_.  See also dc_marknoticed_chat() and dc_markseen_msgs()
+    /// as *noticed*.  See also dc_marknoticed_chat() and dc_markseen_msgs()
    ///
    /// Calling this function usually results in the event `#DC_EVENT_MSGS_CHANGED`.
    pub fn mark_noticed(context: &Context, id: u32) {
@@ -251,7 +263,7 @@ impl Contact {
        .is_ok()
        {
            context.call_cb(Event::MsgsChanged {
-                chat_id: 0,
+                chat_id: ChatId::new(0),
                msg_id: MsgId::new(0),
            });
        }
@@ -399,18 +411,30 @@ impl Contact {
                }
                sth_modified = Modifier::Modified;
            }
-        } else if sql::execute(
-            context,
-            &context.sql,
-            "INSERT INTO contacts (name, addr, origin) VALUES(?, ?, ?);",
-            params![name.as_ref(), addr, origin,],
-        )
-        .is_ok()
-        {
-            row_id = sql::get_rowid(context, &context.sql, "contacts", "addr", addr);
-            sth_modified = Modifier::Created;
        } else {
-            error!(context, "Cannot add contact.");
+            if origin == Origin::IncomingUnknownFrom {
+                update_authname = true;
+            }
+
+            if sql::execute(
+                context,
+                &context.sql,
+                "INSERT INTO contacts (name, addr, origin, authname) VALUES(?, ?, ?, ?);",
+                params![
+                    name.as_ref(),
+                    addr,
+                    origin,
+                    if update_authname { name.as_ref() } else { "" }
+                ],
+            )
+            .is_ok()
+            {
+                row_id = sql::get_rowid(context, &context.sql, "contacts", "addr", addr);
+                sth_modified = Modifier::Created;
+                info!(context, "added contact id={} addr={}", row_id, addr);
+            } else {
+                error!(context, "Cannot add contact.");
+            }
        }

        Ok((row_id, sth_modified))
@@ -428,7 +452,7 @@ impl Contact {
    /// the event `DC_EVENT_CONTACTS_CHANGED` is sent.
    ///
    /// To add a single contact entered by the user, you should prefer `Contact::create`,
-    /// however, for adding a bunch of addresses, this function is _much_ faster.
+    /// however, for adding a bunch of addresses, this function is much faster.
    ///
    /// The `addr_book` is a multiline string in the format `Name one\nAddress one\nName two\nAddress two`.
    ///
@@ -494,7 +518,7 @@ impl Contact {
                params![
                    self_addr,
                    DC_CONTACT_ID_LAST_SPECIAL as i32,
-                    0x100,
+                    Origin::IncomingReplyTo,
                    &s3str_like_cmd,
                    &s3str_like_cmd,
                    if flag_verified_only { 0 } else { 1 },
@@ -712,6 +736,16 @@ impl Contact {
        Ok(Contact::load_from_db(context, contact_id)?)
    }

+    pub fn update_param(&mut self, context: &Context) -> Result<()> {
+        sql::execute(
+            context,
+            &context.sql,
+            "UPDATE contacts SET param=? WHERE id=?",
+            params![self.param.to_string(), self.id as i32],
+        )?;
+        Ok(())
+    }
+
    /// Get the ID of the contact.
    pub fn get_id(&self) -> u32 {
        self.id
@@ -745,6 +779,9 @@ impl Contact {
        if !self.name.is_empty() {
            return &self.name;
        }
+        if !self.authname.is_empty() {
+            return &self.authname;
+        }
        &self.addr
    }

@@ -780,8 +817,11 @@ impl Contact {
            if let Some(p) = context.get_config(Config::Selfavatar) {
                return Some(PathBuf::from(p));
            }
+        } else if let Some(image_rel) = self.param.get(Param::ProfileImage) {
+            if !image_rel.is_empty() {
+                return Some(dc_get_abs_path(context, image_rel));
+            }
        }
-        // TODO: else get image_abs from contact param
        None
    }

@@ -864,22 +904,6 @@ impl Contact {
            .unwrap_or_default() as usize
    }

-    pub fn get_origin_by_id(context: &Context, contact_id: u32, ret_blocked: &mut i32) -> Origin {
-        let mut ret = Origin::Unknown;
-        *ret_blocked = 0;
-
-        if let Ok(contact) = Contact::load_from_db(context, contact_id) {
-            /* we could optimize this by loading only the needed fields */
-            if contact.blocked {
-                *ret_blocked = 1;
-            } else {
-                ret = contact.origin;
-            }
-        }
-
-        ret
-    }
-
    pub fn real_exists_by_id(context: &Context, contact_id: u32) -> bool {
        if !context.sql.is_open() || contact_id <= DC_CONTACT_ID_LAST_SPECIAL {
            return false;
@@ -906,7 +930,7 @@ impl Contact {
 }

 /// Extracts first name from full name.
-fn get_first_name<'a>(full_name: &'a str) -> &'a str {
+fn get_first_name(full_name: &str) -> &str {
    full_name.splitn(2, ' ').next().unwrap_or_default()
 }

@@ -933,21 +957,21 @@ fn set_block_contact(context: &Context, contact_id: u32, new_blocking: bool) {
    }

    if let Ok(contact) = Contact::load_from_db(context, contact_id) {
-        if contact.blocked != new_blocking {
-            if sql::execute(
+        if contact.blocked != new_blocking
+            && sql::execute(
                context,
                &context.sql,
                "UPDATE contacts SET blocked=? WHERE id=?;",
                params![new_blocking as i32, contact_id as i32],
            )
            .is_ok()
-            {
-                // also (un)block all chats with _only_ this contact - we do not delete them to allow a
-                // non-destructive blocking->unblocking.
-                // (Maybe, beside normal chats (type=100) we should also block group chats with only this user.
-                // However, I'm not sure about this point; it may be confusing if the user wants to add other people;
-                // this would result in recreating the same group...)
-                if sql::execute(
+        {
+            // also (un)block all chats with _only_ this contact - we do not delete them to allow a
+            // non-destructive blocking->unblocking.
+            // (Maybe, beside normal chats (type=100) we should also block group chats with only this user.
+            // However, I'm not sure about this point; it may be confusing if the user wants to add other people;
+            // this would result in recreating the same group...)
+            if sql::execute(
                    context,
                    &context.sql,
                    "UPDATE chats SET blocked=? WHERE type=? AND id IN (SELECT chat_id FROM chats_contacts WHERE contact_id=?);",
@@ -956,11 +980,36 @@ fn set_block_contact(context: &Context, contact_id: u32, new_blocking: bool) {
                    Contact::mark_noticed(context, contact_id);
                    context.call_cb(Event::ContactsChanged(None));
                }
-            }
        }
    }
 }

+pub fn set_profile_image(
+    context: &Context,
+    contact_id: u32,
+    profile_image: &AvatarAction,
+) -> Result<()> {
+    // the given profile image is expected to be already in the blob directory
+    // as profile images can be set only by receiving messages, this should be always the case, however.
+    let mut contact = Contact::load_from_db(context, contact_id)?;
+    let changed = match profile_image {
+        AvatarAction::Change(profile_image) => {
+            contact.param.set(Param::ProfileImage, profile_image);
+            true
+        }
+        AvatarAction::Delete => {
+            contact.param.remove(Param::ProfileImage);
+            true
+        }
+        AvatarAction::None => false,
+    };
+    if changed {
+        contact.update_param(context)?;
+        context.call_cb(Event::ContactsChanged(Some(contact_id)));
+    }
+    Ok(())
+}
+
 /// Normalize a name.
 ///
 /// - Remove quotes (come from some bad MUA implementations)
@@ -1025,6 +1074,18 @@ fn cat_fingerprint(
    }
 }

+impl Context {
+    /// determine whether the specified addr maps to the/a self addr
+    pub fn is_self_addr(&self, addr: &str) -> Result<bool> {
+        let self_addr = match self.get_config(Config::ConfiguredAddr) {
+            Some(s) => s,
+            None => return Err(Error::NotConfigured),
+        };
+
+        Ok(addr_cmp(self_addr, addr))
+    }
+}
+
 pub fn addr_cmp(addr1: impl AsRef<str>, addr2: impl AsRef<str>) -> bool {
    let norm1 = addr_normalize(addr1.as_ref()).to_lowercase();
    let norm2 = addr_normalize(addr2.as_ref()).to_lowercase();
@@ -1032,15 +1093,6 @@ pub fn addr_cmp(addr1: impl AsRef<str>, addr2: impl AsRef<str>) -> bool {
    norm1 == norm2
 }

-pub fn addr_equals_self(context: &Context, addr: impl AsRef<str>) -> bool {
-    if !addr.as_ref().is_empty() {
-        if let Some(self_addr) = context.get_config(Config::ConfiguredAddr) {
-            return addr_cmp(addr, self_addr);
-        }
-    }
-    false
-}
-
 fn split_address_book(book: &str) -> Vec<(&str, &str)> {
    book.lines()
        .chunks(2)
@@ -1124,6 +1176,18 @@ mod tests {
        assert_eq!(contacts.len(), 0);
    }

+    #[test]
+    fn test_is_self_addr() -> Result<()> {
+        let t = test_context(None);
+        assert!(t.ctx.is_self_addr("me@me.org").is_err());
+
+        let addr = configure_alice_keypair(&t.ctx);
+        assert_eq!(t.ctx.is_self_addr("me@me.org")?, false);
+        assert_eq!(t.ctx.is_self_addr(&addr)?, true);
+
+        Ok(())
+    }
+
    #[test]
    fn test_add_or_lookup() {
        // add some contacts, this also tests add_address_book()
@@ -1213,6 +1277,63 @@ mod tests {
        assert!(!contact.is_blocked());
    }

+    #[test]
+    fn test_remote_authnames() {
+        let t = dummy_context();
+
+        let (contact_id, sth_modified) = Contact::add_or_lookup(
+            &t.ctx,
+            "bob1",
+            "bob@example.org",
+            Origin::IncomingUnknownFrom,
+        )
+        .unwrap();
+        assert!(contact_id > DC_CONTACT_ID_LAST_SPECIAL);
+        assert_eq!(sth_modified, Modifier::Created);
+        let contact = Contact::load_from_db(&t.ctx, contact_id).unwrap();
+        assert_eq!(contact.get_authname(), "bob1");
+        assert_eq!(contact.get_name(), "bob1");
+        assert_eq!(contact.get_display_name(), "bob1");
+
+        let (contact_id, sth_modified) = Contact::add_or_lookup(
+            &t.ctx,
+            "bob2",
+            "bob@example.org",
+            Origin::IncomingUnknownFrom,
+        )
+        .unwrap();
+        assert!(contact_id > DC_CONTACT_ID_LAST_SPECIAL);
+        assert_eq!(sth_modified, Modifier::Modified);
+        let contact = Contact::load_from_db(&t.ctx, contact_id).unwrap();
+        assert_eq!(contact.get_authname(), "bob2");
+        assert_eq!(contact.get_name(), "bob2");
+        assert_eq!(contact.get_display_name(), "bob2");
+
+        let (contact_id, sth_modified) =
+            Contact::add_or_lookup(&t.ctx, "bob3", "bob@example.org", Origin::ManuallyCreated)
+                .unwrap();
+        assert!(contact_id > DC_CONTACT_ID_LAST_SPECIAL);
+        assert_eq!(sth_modified, Modifier::Modified);
+        let contact = Contact::load_from_db(&t.ctx, contact_id).unwrap();
+        assert_eq!(contact.get_authname(), "bob2");
+        assert_eq!(contact.get_name(), "bob3");
+        assert_eq!(contact.get_display_name(), "bob3");
+
+        let (contact_id, sth_modified) = Contact::add_or_lookup(
+            &t.ctx,
+            "bob4",
+            "bob@example.org",
+            Origin::IncomingUnknownFrom,
+        )
+        .unwrap();
+        assert!(contact_id > DC_CONTACT_ID_LAST_SPECIAL);
+        assert_eq!(sth_modified, Modifier::Modified);
+        let contact = Contact::load_from_db(&t.ctx, contact_id).unwrap();
+        assert_eq!(contact.get_authname(), "bob4");
+        assert_eq!(contact.get_name(), "bob3");
+        assert_eq!(contact.get_display_name(), "bob3");
+    }
+
    #[test]
    fn test_addr_cmp() {
        assert!(addr_cmp("AA@AA.ORG", "aa@aa.ORG"));
--- a/src/context.rs
+++ b/src/context.rs
@@ -1,10 +1,10 @@
+//! Context module
+
 use std::collections::HashMap;
 use std::ffi::OsString;
 use std::path::{Path, PathBuf};
 use std::sync::{Arc, Condvar, Mutex, RwLock};

-use libc::uintptr_t;
-
 use crate::chat::*;
 use crate::config::Config;
 use crate::constants::*;
@@ -14,10 +14,10 @@ use crate::events::Event;
 use crate::imap::*;
 use crate::job::*;
 use crate::job_thread::JobThread;
-use crate::key::*;
+use crate::key::Key;
 use crate::login_param::LoginParam;
 use crate::lot::Lot;
-use crate::message::{self, Message, MsgId};
+use crate::message::{self, Message, MessengerMessage, MsgId};
 use crate::param::Params;
 use crate::smtp::Smtp;
 use crate::sql::Sql;
@@ -30,12 +30,7 @@ use crate::sql::Sql;
 /// * `event` - One of the [Event] items.
 /// * `data1` - Depends on the event parameter, see [Event].
 /// * `data2` - Depends on the event parameter, see [Event].
-///
-/// # Returns
-///
-/// This callback must return 0 unless stated otherwise in the event
-/// description at [Event].
-pub type ContextCallback = dyn Fn(&Context, Event) -> uintptr_t + Send + Sync;
+pub type ContextCallback = dyn Fn(&Context, Event) -> () + Send + Sync;

 #[derive(DebugStub)]
 pub struct Context {
@@ -55,7 +50,7 @@ pub struct Context {
    #[debug_stub = "Callback"]
    cb: Box<ContextCallback>,
    pub os_name: Option<String>,
-    pub cmdline_sel_chat_id: Arc<RwLock<u32>>,
+    pub cmdline_sel_chat_id: Arc<RwLock<ChatId>>,
    pub bob: Arc<RwLock<BobStatus>>,
    pub last_smeared_timestamp: RwLock<i64>,
    pub running_state: Arc<RwLock<RunningState>>,
@@ -80,16 +75,7 @@ pub fn get_info() -> HashMap<&'static str, String> {
    let mut res = HashMap::new();
    res.insert("deltachat_core_version", format!("v{}", &*DC_VERSION_STR));
    res.insert("sqlite_version", rusqlite::version().to_string());
-    res.insert(
-        "sqlite_thread_safe",
-        unsafe { rusqlite::ffi::sqlite3_threadsafe() }.to_string(),
-    );
-    res.insert(
-        "arch",
-        (std::mem::size_of::<*mut libc::c_void>())
-            .wrapping_mul(8)
-            .to_string(),
-    );
+    res.insert("arch", (std::mem::size_of::<usize>() * 8).to_string());
    res.insert("level", "awesome".into());
    res
 }
@@ -97,6 +83,8 @@ pub fn get_info() -> HashMap<&'static str, String> {
 impl Context {
    /// Creates new context.
    pub fn new(cb: Box<ContextCallback>, os_name: String, dbfile: PathBuf) -> Result<Context> {
+        pretty_env_logger::try_init_timed().ok();
+
        let mut blob_fname = OsString::new();
        blob_fname.push(dbfile.file_name().unwrap_or_default());
        blob_fname.push("-blobs");
@@ -130,7 +118,7 @@ impl Context {
            oauth2_critical: Arc::new(Mutex::new(())),
            bob: Arc::new(RwLock::new(Default::default())),
            last_smeared_timestamp: RwLock::new(0),
-            cmdline_sel_chat_id: Arc::new(RwLock::new(0)),
+            cmdline_sel_chat_id: Arc::new(RwLock::new(ChatId::new(0))),
            inbox_thread: Arc::new(RwLock::new(JobThread::new(
                "INBOX",
                "configured_inbox_folder",
@@ -170,8 +158,8 @@ impl Context {
        self.blobdir.as_path()
    }

-    pub fn call_cb(&self, event: Event) -> uintptr_t {
-        (*self.cb)(self, event)
+    pub fn call_cb(&self, event: Event) {
+        (*self.cb)(self, event);
    }

    /*******************************************************************************
@@ -296,6 +284,11 @@ impl Context {
        res.insert("database_version", dbversion.to_string());
        res.insert("blobdir", self.get_blobdir().display().to_string());
        res.insert("display_name", displayname.unwrap_or_else(|| unset.into()));
+        res.insert(
+            "selfavatar",
+            self.get_config(Config::Selfavatar)
+                .unwrap_or_else(|| "<unset>".to_string()),
+        );
        res.insert("is_configured", is_configured.to_string());
        res.insert("entered_account_settings", l.to_string());
        res.insert("used_account_settings", l2.to_string());
@@ -354,7 +347,7 @@ impl Context {
    }

    #[allow(non_snake_case)]
-    pub fn search_msgs(&self, chat_id: u32, query: impl AsRef<str>) -> Vec<MsgId> {
+    pub fn search_msgs(&self, chat_id: ChatId, query: impl AsRef<str>) -> Vec<MsgId> {
        let real_query = query.as_ref().trim();
        if real_query.is_empty() {
            return Vec::new();
@@ -362,7 +355,7 @@ impl Context {
        let strLikeInText = format!("%{}%", real_query);
        let strLikeBeg = format!("{}%", real_query);

-        let query = if 0 != chat_id {
+        let query = if !chat_id.is_unset() {
            concat!(
                "SELECT m.id AS id, m.timestamp AS timestamp",
                " FROM msgs m",
@@ -394,7 +387,7 @@ impl Context {
        self.sql
            .query_map(
                query,
-                params![chat_id as i32, &strLikeInText, &strLikeBeg],
+                params![chat_id, &strLikeInText, &strLikeBeg],
                |row| row.get::<_, MsgId>("id"),
                |rows| {
                    let mut ret = Vec::new();
@@ -445,15 +438,17 @@ impl Context {
                return;
            }

-            // 1 = dc message, 2 = reply to dc message
-            if 0 != msg.is_dc_message {
-                job_add(
-                    self,
-                    Action::MoveMsg,
-                    msg.id.to_u32() as i32,
-                    Params::new(),
-                    0,
-                );
+            match msg.is_dc_message {
+                MessengerMessage::No => {}
+                MessengerMessage::Yes | MessengerMessage::Reply => {
+                    job_add(
+                        self,
+                        Action::MoveMsg,
+                        msg.id.to_u32() as i32,
+                        Params::new(),
+                        0,
+                    );
+                }
            }
        }
    }
@@ -526,7 +521,7 @@ mod tests {
        let tmp = tempfile::tempdir().unwrap();
        let dbfile = tmp.path().join("db.sqlite");
        std::fs::write(&dbfile, b"123").unwrap();
-        let res = Context::new(Box::new(|_, _| 0), "FakeOs".into(), dbfile);
+        let res = Context::new(Box::new(|_, _| ()), "FakeOs".into(), dbfile);
        assert!(res.is_err());
    }

@@ -541,7 +536,7 @@ mod tests {
    fn test_blobdir_exists() {
        let tmp = tempfile::tempdir().unwrap();
        let dbfile = tmp.path().join("db.sqlite");
-        Context::new(Box::new(|_, _| 0), "FakeOS".into(), dbfile).unwrap();
+        Context::new(Box::new(|_, _| ()), "FakeOS".into(), dbfile).unwrap();
        let blobdir = tmp.path().join("db.sqlite-blobs");
        assert!(blobdir.is_dir());
    }
@@ -552,7 +547,7 @@ mod tests {
        let dbfile = tmp.path().join("db.sqlite");
        let blobdir = tmp.path().join("db.sqlite-blobs");
        std::fs::write(&blobdir, b"123").unwrap();
-        let res = Context::new(Box::new(|_, _| 0), "FakeOS".into(), dbfile);
+        let res = Context::new(Box::new(|_, _| ()), "FakeOS".into(), dbfile);
        assert!(res.is_err());
    }

@@ -562,7 +557,7 @@ mod tests {
        let subdir = tmp.path().join("subdir");
        let dbfile = subdir.join("db.sqlite");
        let dbfile2 = dbfile.clone();
-        Context::new(Box::new(|_, _| 0), "FakeOS".into(), dbfile).unwrap();
+        Context::new(Box::new(|_, _| ()), "FakeOS".into(), dbfile).unwrap();
        assert!(subdir.is_dir());
        assert!(dbfile2.is_file());
    }
@@ -572,7 +567,7 @@ mod tests {
        let tmp = tempfile::tempdir().unwrap();
        let dbfile = tmp.path().join("db.sqlite");
        let blobdir = PathBuf::new();
-        let res = Context::with_blobdir(Box::new(|_, _| 0), "FakeOS".into(), dbfile, blobdir);
+        let res = Context::with_blobdir(Box::new(|_, _| ()), "FakeOS".into(), dbfile, blobdir);
        assert!(res.is_err());
    }

@@ -581,7 +576,7 @@ mod tests {
        let tmp = tempfile::tempdir().unwrap();
        let dbfile = tmp.path().join("db.sqlite");
        let blobdir = tmp.path().join("blobs");
-        let res = Context::with_blobdir(Box::new(|_, _| 0), "FakeOS".into(), dbfile, blobdir);
+        let res = Context::with_blobdir(Box::new(|_, _| ()), "FakeOS".into(), dbfile, blobdir);
        assert!(res.is_err());
    }

--- a/src/dc_receive_imf.rs
+++ b/src/dc_receive_imf.rs
--- a/src/dc_simplify.rs
+++ b/src/dc_simplify.rs
@@ -1,273 +0,0 @@
-use crate::dehtml::*;
-
-#[derive(Copy, Clone)]
-pub struct Simplify {
-    pub is_forwarded: bool,
-}
-
-/// Return index of footer line in vector of message lines, or vector length if
-/// no footer is found.
-///
-/// Also return whether not-standard (rfc3676, §4.3) footer is found.
-fn find_message_footer(lines: &[&str]) -> (usize, bool) {
-    for (ix, &line) in lines.iter().enumerate() {
-        // quoted-printable may encode `-- ` to `-- =20` which is converted
-        // back to `--  `
-        match line {
-            "-- " | "--  " => return (ix, false),
-            "--" | "---" | "----" => return (ix, true),
-            _ => (),
-        }
-    }
-    (lines.len(), false)
-}
-
-impl Simplify {
-    pub fn new() -> Self {
-        Simplify {
-            is_forwarded: false,
-        }
-    }
-
-    /// Simplify and normalise text: Remove quotes, signatures, unnecessary
-    /// lineends etc.
-    /// The data returned from simplify() must be free()'d when no longer used.
-    pub fn simplify(&mut self, input: &str, is_html: bool, is_msgrmsg: bool) -> String {
-        let mut out = if is_html {
-            dehtml(input)
-        } else {
-            input.to_string()
-        };
-
-        out.retain(|c| c != '\r');
-        out = self.simplify_plain_text(&out, is_msgrmsg);
-        out.retain(|c| c != '\r');
-
-        out
-    }
-
-    /**
-     * Simplify Plain Text
-     */
-    #[allow(non_snake_case)]
-    fn simplify_plain_text(&mut self, buf_terminated: &str, is_msgrmsg: bool) -> String {
-        /* This function ...
-        ... removes all text after the line `-- ` (footer mark)
-        ... removes full quotes at the beginning and at the end of the text -
-            these are all lines starting with the character `>`
-        ... remove a non-empty line before the removed quote (contains sth. like "On 2.9.2016, Bjoern wrote:" in different formats and lanugages) */
-        /* split the given buffer into lines */
-        let lines: Vec<_> = buf_terminated.split('\n').collect();
-        let mut l_first: usize = 0;
-        let mut is_cut_at_begin = false;
-        let (mut l_last, mut is_cut_at_end) = find_message_footer(&lines);
-
-        if l_last > l_first + 2 {
-            let line0 = lines[l_first];
-            let line1 = lines[l_first + 1];
-            let line2 = lines[l_first + 2];
-            if line0 == "---------- Forwarded message ----------"
-                && line1.starts_with("From: ")
-                && line2.is_empty()
-            {
-                self.is_forwarded = true;
-                l_first += 3
-            }
-        }
-        for l in l_first..l_last {
-            let line = lines[l];
-            if line == "-----"
-                || line == "_____"
-                || line == "====="
-                || line == "*****"
-                || line == "~~~~~"
-            {
-                l_last = l;
-                is_cut_at_end = true;
-                /* done */
-                break;
-            }
-        }
-        if !is_msgrmsg {
-            let mut l_lastQuotedLine = None;
-            for l in (l_first..l_last).rev() {
-                let line = lines[l];
-                if is_plain_quote(line) {
-                    l_lastQuotedLine = Some(l)
-                } else if !is_empty_line(line) {
-                    break;
-                }
-            }
-            if let Some(last_quoted_line) = l_lastQuotedLine {
-                l_last = last_quoted_line;
-                is_cut_at_end = true;
-                if l_last > 1 && is_empty_line(lines[l_last - 1]) {
-                    l_last -= 1
-                }
-                if l_last > 1 {
-                    let line = lines[l_last - 1];
-                    if is_quoted_headline(line) {
-                        l_last -= 1
-                    }
-                }
-            }
-        }
-        if !is_msgrmsg {
-            let mut l_lastQuotedLine_0 = None;
-            let mut hasQuotedHeadline = 0;
-            for l in l_first..l_last {
-                let line = lines[l];
-                if is_plain_quote(line) {
-                    l_lastQuotedLine_0 = Some(l)
-                } else if !is_empty_line(line) {
-                    if is_quoted_headline(line)
-                        && 0 == hasQuotedHeadline
-                        && l_lastQuotedLine_0.is_none()
-                    {
-                        hasQuotedHeadline = 1i32
-                    } else {
-                        /* non-quoting line found */
-                        break;
-                    }
-                }
-            }
-            if let Some(last_quoted_line) = l_lastQuotedLine_0 {
-                l_first = last_quoted_line + 1;
-                is_cut_at_begin = true
-            }
-        }
-        /* re-create buffer from the remaining lines */
-        let mut ret = String::new();
-        if is_cut_at_begin {
-            ret += "[...]";
-        }
-        /* we write empty lines only in case and non-empty line follows */
-        let mut pending_linebreaks = 0;
-        let mut content_lines_added = 0;
-        for l in l_first..l_last {
-            let line = lines[l];
-            if is_empty_line(line) {
-                pending_linebreaks += 1
-            } else {
-                if 0 != content_lines_added {
-                    if pending_linebreaks > 2i32 {
-                        pending_linebreaks = 2i32
-                    }
-                    while 0 != pending_linebreaks {
-                        ret += "\n";
-                        pending_linebreaks -= 1
-                    }
-                }
-                // the incoming message might contain invalid UTF8
-                ret += line;
-                content_lines_added += 1;
-                pending_linebreaks = 1i32
-            }
-        }
-        if is_cut_at_end && (!is_cut_at_begin || 0 != content_lines_added) {
-            ret += " [...]";
-        }
-
-        ret
-    }
-}
-
-/**
- * Tools
- */
-fn is_empty_line(buf: &str) -> bool {
-    // XXX: can it be simplified to buf.chars().all(|c| c.is_whitespace())?
-    //
-    // Strictly speaking, it is not equivalent (^A is not whitespace, but less than ' '),
-    // but having control sequences in email body?!
-    //
-    // See discussion at: https://github.com/deltachat/deltachat-core-rust/pull/402#discussion_r317062392
-    for c in buf.chars() {
-        if c > ' ' {
-            return false;
-        }
-    }
-
-    true
-}
-
-fn is_quoted_headline(buf: &str) -> bool {
-    /* This function may be called for the line _directly_ before a quote.
-    The function checks if the line contains sth. like "On 01.02.2016, xy@z wrote:" in various languages.
-    - Currently, we simply check if the last character is a ':'.
-    - Checking for the existence of an email address may fail (headlines may show the user's name instead of the address) */
-
-    buf.len() <= 80 && buf.ends_with(':')
-}
-
-fn is_plain_quote(buf: &str) -> bool {
-    buf.starts_with('>')
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use proptest::prelude::*;
-
-    proptest! {
-        #[test]
-        // proptest does not support [[:graphical:][:space:]] regex.
-        fn test_simplify_plain_text_fuzzy(input in "[!-~\t \n]+") {
-            let output = Simplify::new().simplify_plain_text(&input, true);
-            assert!(output.split('\n').all(|s| s != "-- "));
-        }
-    }
-
-    #[test]
-    fn test_simplify_trim() {
-        let mut simplify = Simplify::new();
-        let html = "\r\r\nline1<br>\r\n\r\n\r\rline2\n\r";
-        let plain = simplify.simplify(html, true, false);
-
-        assert_eq!(plain, "line1\nline2");
-    }
-
-    #[test]
-    fn test_simplify_parse_href() {
-        let mut simplify = Simplify::new();
-        let html = "<a href=url>text</a";
-        let plain = simplify.simplify(html, true, false);
-
-        assert_eq!(plain, "[text](url)");
-    }
-
-    #[test]
-    fn test_simplify_bold_text() {
-        let mut simplify = Simplify::new();
-        let html = "<!DOCTYPE name [<!DOCTYPE ...>]><!-- comment -->text <b><?php echo ... ?>bold</b><![CDATA[<>]]>";
-        let plain = simplify.simplify(html, true, false);
-
-        assert_eq!(plain, "text *bold*<>");
-    }
-
-    #[test]
-    fn test_simplify_html_encoded() {
-        let mut simplify = Simplify::new();
-        let html =
-                "&lt;&gt;&quot;&apos;&amp; &auml;&Auml;&ouml;&Ouml;&uuml;&Uuml;&szlig; foo&AElig;&ccedil;&Ccedil; &diams;&lrm;&rlm;&zwnj;&noent;&zwj;";
-
-        let plain = simplify.simplify(html, true, false);
-
-        assert_eq!(
-            plain,
-            "<>\"\'& äÄöÖüÜß fooÆçÇ \u{2666}\u{200e}\u{200f}\u{200c}&noent;\u{200d}"
-        );
-    }
-
-    #[test]
-    fn test_simplify_utilities() {
-        assert!(is_empty_line(" \t"));
-        assert!(is_empty_line(""));
-        assert!(is_empty_line(" \r"));
-        assert!(!is_empty_line(" x"));
-        assert!(is_plain_quote("> hello world"));
-        assert!(is_plain_quote(">>"));
-        assert!(!is_plain_quote("Life is pain"));
-        assert!(!is_plain_quote(""));
-    }
-}
--- a/src/dc_strencode.rs
+++ b/src/dc_strencode.rs
@@ -1,74 +0,0 @@
-use itertools::Itertools;
-
-/// Encode non-ascii-strings as `=?UTF-8?Q?Bj=c3=b6rn_Petersen?=`.
-/// Belongs to RFC 2047: https://tools.ietf.org/html/rfc2047
-///
-/// We do not fold at position 72; this would result in empty words as `=?utf-8?Q??=` which are correct,
-/// but cannot be displayed by some mail programs (eg. Android Stock Mail).
-/// however, this is not needed, as long as _one_ word is not longer than 72 characters.
-/// _if_ it is, the display may get weird.  This affects the subject only.
-/// the best solution wor all this would be if libetpan encodes the line as only libetpan knowns when a header line is full.
-///
-/// @param to_encode Null-terminated UTF-8-string to encode.
-/// @return Returns the encoded string which must be free()'d when no longed needed.
-///     On errors, NULL is returned.
-pub fn dc_encode_header_words(input: impl AsRef<str>) -> String {
-    let mut result = String::default();
-    for (_, group) in &input.as_ref().chars().group_by(|c| c.is_whitespace()) {
-        let word: String = group.collect();
-        result.push_str(&quote_word(&word.as_bytes()));
-    }
-
-    result
-}
-
-fn must_encode(byte: u8) -> bool {
-    static SPECIALS: &[u8] = b",:!\"#$@[\\]^`{|}~=?_";
-
-    SPECIALS.iter().any(|b| *b == byte)
-}
-
-fn quote_word(word: &[u8]) -> String {
-    let mut result = String::default();
-    let mut encoded = false;
-
-    for byte in word {
-        let byte = *byte;
-        if byte >= 128 || must_encode(byte) {
-            result.push_str(&format!("={:2X}", byte));
-            encoded = true;
-        } else if byte == b' ' {
-            result.push('_');
-            encoded = true;
-        } else {
-            result.push(byte as _);
-        }
-    }
-
-    if encoded {
-        result = format!("=?utf-8?Q?{}?=", &result);
-    }
-    result
-}
-
-/* ******************************************************************************
- * Encode/decode header words, RFC 2047
- ******************************************************************************/
-
-pub fn dc_needs_ext_header(to_check: impl AsRef<str>) -> bool {
-    let to_check = to_check.as_ref();
-
-    if to_check.is_empty() {
-        return false;
-    }
-
-    to_check.chars().any(|c| {
-        !(c.is_ascii_alphanumeric()
-            || c == '-'
-            || c == '_'
-            || c == '_'
-            || c == '.'
-            || c == '~'
-            || c == '%')
-    })
-}
--- a/src/dc_tools.rs
+++ b/src/dc_tools.rs
@@ -49,8 +49,8 @@ pub(crate) fn dc_truncate(buf: &str, approx_chars: usize, do_unwrap: bool) -> Co
 /// - harmonize together while being different enough
 /// (therefore, we cannot just use random rgb colors :)
 const COLORS: [u32; 16] = [
-    0xe56555, 0xf28c48, 0x8e85ee, 0x76c84d, 0x5bb6cc, 0x549cdd, 0xd25c99, 0xb37800, 0xf23030,
-    0x39b249, 0xbb243b, 0x964078, 0x66874f, 0x308ab9, 0x127ed0, 0xbe450c,
+    0xe5_65_55, 0xf2_8c_48, 0x8e_85_ee, 0x76_c8_4d, 0x5b_b6_cc, 0x54_9c_dd, 0xd2_5c_99, 0xb3_78_00,
+    0xf2_30_30, 0x39_b2_49, 0xbb_24_3b, 0x96_40_78, 0x66_87_4f, 0x30_8a_b9, 0x12_7e_d0, 0xbe_45_0c,
 ];

 pub(crate) fn dc_str_to_color(s: impl AsRef<str>) -> u32 {
@@ -59,7 +59,7 @@ pub(crate) fn dc_str_to_color(s: impl AsRef<str>) -> u32 {
    let bytes = str_lower.as_bytes();
    for (i, byte) in bytes.iter().enumerate() {
        checksum += (i + 1) * *byte as usize;
-        checksum %= 0xffffff;
+        checksum %= 0x00ff_ffff;
    }
    let color_index = checksum % COLORS.len();

@@ -182,22 +182,6 @@ fn encode_66bits_as_base64(v1: u32, v2: u32, fill: u32) -> String {
    String::from_utf8(wrapped_writer).unwrap()
 }

-pub(crate) fn dc_create_incoming_rfc724_mid(
-    message_timestamp: i64,
-    contact_id_from: u32,
-    contact_ids_to: &[u32],
-) -> Option<String> {
-    /* create a deterministic rfc724_mid from input such that
-    repeatedly calling it with the same input results in the same Message-id */
-
-    let largest_id_to = contact_ids_to.iter().max().copied().unwrap_or_default();
-    let result = format!(
-        "{}-{}-{}@stub",
-        message_timestamp, contact_id_from, largest_id_to
-    );
-    Some(result)
-}
-
 /// Function generates a Message-ID that can be used for a new outgoing message.
 /// - this function is called for all outgoing messages.
 /// - the message ID should be globally unique
@@ -217,8 +201,11 @@ pub(crate) fn dc_create_outgoing_rfc724_mid(grpid: Option<&str>, from_addr: &str
 ///
 /// # Arguments
 ///
-/// * `mid` - A string that holds the message id
+/// * `mid` - A string that holds the message id.  Leading/Trailing <>
+/// characters are automatically stripped.
 pub(crate) fn dc_extract_grpid_from_rfc724_mid(mid: &str) -> Option<&str> {
+    let mid = mid.trim_start_matches('<').trim_end_matches('>');
+
    if mid.len() < 9 || !mid.starts_with("Gr.") {
        return None;
    }
@@ -235,58 +222,11 @@ pub(crate) fn dc_extract_grpid_from_rfc724_mid(mid: &str) -> Option<&str> {
    None
 }

-pub(crate) fn dc_ensure_no_slash_safe(path: &str) -> &str {
-    if path.ends_with('/') || path.ends_with('\\') {
-        return &path[..path.len() - 1];
-    }
-    path
-}
-
-// Function returns a sanitized basename that does not contain
-// win/linux path separators and also not any non-ascii chars
-fn get_safe_basename(filename: &str) -> String {
-    // return the (potentially mangled) basename of the input filename
-    // this might be a path that comes in from another operating system
-    let mut index: usize = 0;
-
-    if let Some(unix_index) = filename.rfind('/') {
-        index = unix_index + 1;
-    }
-    if let Some(win_index) = filename.rfind('\\') {
-        index = max(index, win_index + 1);
-    }
-    if index >= filename.len() {
-        "nobasename".to_string()
-    } else {
-        // we don't allow any non-ascii to be super-safe
-        filename[index..].replace(|c: char| !c.is_ascii() || c == ':', "-")
-    }
-}
-
-pub fn dc_derive_safe_stem_ext(filename: &str) -> (String, String) {
-    let basename = get_safe_basename(&filename);
-    let (mut stem, mut ext) = if let Some(index) = basename.rfind('.') {
-        (
-            basename[0..index].to_string(),
-            basename[index..].to_string(),
-        )
-    } else {
-        (basename, "".to_string())
-    };
-    // limit length of stem and ext
-    stem.truncate(32);
-    ext.truncate(32);
-    (stem, ext)
-}
-
 // the returned suffix is lower-case
-#[allow(non_snake_case)]
 pub fn dc_get_filesuffix_lc(path_filename: impl AsRef<str>) -> Option<String> {
-    if let Some(p) = Path::new(path_filename.as_ref()).extension() {
-        Some(p.to_string_lossy().to_lowercase())
-    } else {
-        None
-    }
+    Path::new(path_filename.as_ref())
+        .extension()
+        .map(|p| p.to_string_lossy().to_lowercase())
 }

 /// Returns the `(width, height)` of the given image buffer.
@@ -403,11 +343,14 @@ pub(crate) fn dc_copy_file(
    }
 }

-pub(crate) fn dc_create_folder(context: &Context, path: impl AsRef<std::path::Path>) -> bool {
+pub(crate) fn dc_create_folder(
+    context: &Context,
+    path: impl AsRef<std::path::Path>,
+) -> Result<(), std::io::Error> {
    let path_abs = dc_get_abs_path(context, &path);
    if !path_abs.exists() {
        match fs::create_dir_all(path_abs) {
-            Ok(_) => true,
+            Ok(_) => Ok(()),
            Err(err) => {
                warn!(
                    context,
@@ -415,11 +358,11 @@ pub(crate) fn dc_create_folder(context: &Context, path: impl AsRef<std::path::Pa
                    path.as_ref().display(),
                    err
                );
-                false
+                Err(err)
            }
        }
    } else {
-        true
+        Ok(())
    }
 }

@@ -505,7 +448,7 @@ pub(crate) fn dc_get_next_backup_path(
 pub(crate) fn time() -> i64 {
    SystemTime::now()
        .duration_since(SystemTime::UNIX_EPOCH)
-        .unwrap()
+        .unwrap_or_default()
        .as_secs() as i64
 }

@@ -525,7 +468,7 @@ pub(crate) fn time() -> i64 {
 /// assert_eq!(&email.domain, "example.com");
 /// assert_eq!(email.to_string(), "someone@example.com");
 /// ```
-#[derive(Debug, PartialEq, Clone)]
+#[derive(Debug, PartialEq, Eq, Clone)]
 pub struct EmailAddress {
    pub local: String,
    pub domain: String,
@@ -673,7 +616,6 @@ mod tests {
        );
    }

-    #[test]
    #[test]
    fn test_dc_extract_grpid_from_rfc724_mid() {
        // Should return None if we pass invalid mid
@@ -695,6 +637,16 @@ mod tests {
        let mid = "Gr.1234567890123456.morerandom@domain.de";
        let grpid = dc_extract_grpid_from_rfc724_mid(mid);
        assert_eq!(grpid, Some("1234567890123456"));
+
+        // Should return extracted grpid for grpid with length of 11
+        let mid = "<Gr.12345678901.morerandom@domain.de>";
+        let grpid = dc_extract_grpid_from_rfc724_mid(mid);
+        assert_eq!(grpid, Some("12345678901"));
+
+        // Should return extracted grpid for grpid with length of 11
+        let mid = "<Gr.1234567890123456.morerandom@domain.de>";
+        let grpid = dc_extract_grpid_from_rfc724_mid(mid);
+        assert_eq!(grpid, Some("1234567890123456"));
    }

    #[test]
@@ -718,29 +670,29 @@ mod tests {

    #[test]
    fn test_emailaddress_parse() {
-        assert_eq!(EmailAddress::new("").is_ok(), false);
+        assert_eq!("".parse::<EmailAddress>().is_ok(), false);
        assert_eq!(
-            EmailAddress::new("user@domain.tld").unwrap(),
+            "user@domain.tld".parse::<EmailAddress>().unwrap(),
            EmailAddress {
                local: "user".into(),
                domain: "domain.tld".into(),
            }
        );
-        assert_eq!(EmailAddress::new("uuu").is_ok(), false);
-        assert_eq!(EmailAddress::new("dd.tt").is_ok(), false);
-        assert_eq!(EmailAddress::new("tt.dd@uu").is_ok(), false);
-        assert_eq!(EmailAddress::new("u@d").is_ok(), false);
-        assert_eq!(EmailAddress::new("u@d.").is_ok(), false);
-        assert_eq!(EmailAddress::new("u@d.t").is_ok(), false);
+        assert_eq!("uuu".parse::<EmailAddress>().is_ok(), false);
+        assert_eq!("dd.tt".parse::<EmailAddress>().is_ok(), false);
+        assert_eq!("tt.dd@uu".parse::<EmailAddress>().is_ok(), false);
+        assert_eq!("u@d".parse::<EmailAddress>().is_ok(), false);
+        assert_eq!("u@d.".parse::<EmailAddress>().is_ok(), false);
+        assert_eq!("u@d.t".parse::<EmailAddress>().is_ok(), false);
        assert_eq!(
-            EmailAddress::new("u@d.tt").unwrap(),
+            "u@d.tt".parse::<EmailAddress>().unwrap(),
            EmailAddress {
                local: "u".into(),
                domain: "d.tt".into(),
            }
        );
-        assert_eq!(EmailAddress::new("u@.tt").is_ok(), false);
-        assert_eq!(EmailAddress::new("@d.tt").is_ok(), false);
+        assert_eq!("u@tt".parse::<EmailAddress>().is_ok(), false);
+        assert_eq!("@d.tt".parse::<EmailAddress>().is_ok(), false);
    }

    use proptest::prelude::*;
@@ -776,27 +728,6 @@ mod tests {
        }
    }

-    #[test]
-    fn test_dc_create_incoming_rfc724_mid() {
-        let res = dc_create_incoming_rfc724_mid(123, 45, &vec![6, 7]);
-        assert_eq!(res, Some("123-45-7@stub".into()));
-        let res = dc_create_incoming_rfc724_mid(123, 45, &vec![]);
-        assert_eq!(res, Some("123-45-0@stub".into()));
-    }
-
-    #[test]
-    fn test_file_get_safe_basename() {
-        assert_eq!(get_safe_basename("12312/hello"), "hello");
-        assert_eq!(get_safe_basename("12312\\hello"), "hello");
-        assert_eq!(get_safe_basename("//12312\\hello"), "hello");
-        assert_eq!(get_safe_basename("//123:12\\hello"), "hello");
-        assert_eq!(get_safe_basename("//123:12/\\\\hello"), "hello");
-        assert_eq!(get_safe_basename("//123:12//hello"), "hello");
-        assert_eq!(get_safe_basename("//123:12//"), "nobasename");
-        assert_eq!(get_safe_basename("//123:12/"), "nobasename");
-        assert!(get_safe_basename("123\x012.hello").ends_with(".hello"));
-    }
-
    #[test]
    fn test_file_handling() {
        let t = dummy_context();
@@ -845,7 +776,7 @@ mod tests {

        assert!(dc_delete_file(context, "$BLOBDIR/foobar"));
        assert!(dc_delete_file(context, "$BLOBDIR/dada"));
-        assert!(dc_create_folder(context, "$BLOBDIR/foobar-folder"));
+        assert!(dc_create_folder(context, "$BLOBDIR/foobar-folder").is_ok());
        assert!(dc_file_exist(context, "$BLOBDIR/foobar-folder",));
        assert!(!dc_delete_file(context, "$BLOBDIR/foobar-folder"));

@@ -859,15 +790,15 @@ mod tests {
    #[test]
    fn test_listflags_has() {
        let listflags: u32 = 0x1101;
-        assert!(listflags_has(listflags, 0x1) == true);
-        assert!(listflags_has(listflags, 0x10) == false);
-        assert!(listflags_has(listflags, 0x100) == true);
-        assert!(listflags_has(listflags, 0x1000) == true);
+        assert!(listflags_has(listflags, 0x1));
+        assert!(!listflags_has(listflags, 0x10));
+        assert!(listflags_has(listflags, 0x100));
+        assert!(listflags_has(listflags, 0x1000));
        let listflags: u32 = (DC_GCL_ADD_SELF | DC_GCL_VERIFIED_ONLY).try_into().unwrap();
-        assert!(listflags_has(listflags, DC_GCL_VERIFIED_ONLY) == true);
-        assert!(listflags_has(listflags, DC_GCL_ADD_SELF) == true);
+        assert!(listflags_has(listflags, DC_GCL_VERIFIED_ONLY));
+        assert!(listflags_has(listflags, DC_GCL_ADD_SELF));
        let listflags: u32 = DC_GCL_VERIFIED_ONLY.try_into().unwrap();
-        assert!(listflags_has(listflags, DC_GCL_ADD_SELF) == false);
+        assert!(!listflags_has(listflags, DC_GCL_ADD_SELF));
    }

    #[test]
--- a/src/dehtml.rs
+++ b/src/dehtml.rs
@@ -139,13 +139,12 @@ fn dehtml_starttag_cb<B: std::io::BufRead>(
            dehtml.add_text = AddText::YesPreserveLineEnds;
        }
        "a" => {
-            if let Some(href) = event.html_attributes().find(|attr| {
-                attr.as_ref()
-                    .map(|a| String::from_utf8_lossy(a.key).trim().to_lowercase() == "href")
-                    .unwrap_or_default()
-            }) {
+            if let Some(href) = event
+                .html_attributes()
+                .filter_map(|attr| attr.ok())
+                .find(|attr| String::from_utf8_lossy(attr.key).trim().to_lowercase() == "href")
+            {
                let href = href
-                    .unwrap()
                    .unescape_and_decode_value(reader)
                    .unwrap_or_default()
                    .to_lowercase();
@@ -189,4 +188,41 @@ mod tests {
            assert_eq!(dehtml(input), output);
        }
    }
+
+    #[test]
+    fn test_dehtml_parse_br() {
+        let html = "\r\r\nline1<br>\r\n\r\n\r\rline2\n\r";
+        let plain = dehtml(html);
+
+        assert_eq!(plain, "line1\n\r\r\rline2");
+    }
+
+    #[test]
+    fn test_dehtml_parse_href() {
+        let html = "<a href=url>text</a";
+        let plain = dehtml(html);
+
+        assert_eq!(plain, "[text](url)");
+    }
+
+    #[test]
+    fn test_dehtml_bold_text() {
+        let html = "<!DOCTYPE name [<!DOCTYPE ...>]><!-- comment -->text <b><?php echo ... ?>bold</b><![CDATA[<>]]>";
+        let plain = dehtml(html);
+
+        assert_eq!(plain, "text *bold*<>");
+    }
+
+    #[test]
+    fn test_dehtml_html_encoded() {
+        let html =
+                "&lt;&gt;&quot;&apos;&amp; &auml;&Auml;&ouml;&Ouml;&uuml;&Uuml;&szlig; foo&AElig;&ccedil;&Ccedil; &diams;&lrm;&rlm;&zwnj;&noent;&zwj;";
+
+        let plain = dehtml(html);
+
+        assert_eq!(
+            plain,
+            "<>\"\'& äÄöÖüÜß fooÆçÇ \u{2666}\u{200e}\u{200f}\u{200c}&noent;\u{200d}"
+        );
+    }
 }
--- a/src/e2ee.rs
+++ b/src/e2ee.rs
@@ -1,26 +1,28 @@
 //! End-to-end encryption support.

 use std::collections::HashSet;
+use std::convert::TryFrom;

-use mailparse::MailHeaderMap;
+use mailparse::ParsedMail;
 use num_traits::FromPrimitive;

 use crate::aheader::*;
 use crate::config::Config;
 use crate::context::Context;
+use crate::dc_tools::EmailAddress;
 use crate::error::*;
-use crate::key::*;
+use crate::headerdef::{HeaderDef, HeaderDefMap};
+use crate::key::{self, Key, KeyPairUse, SignedPublicKey};
 use crate::keyring::*;
 use crate::peerstate::*;
 use crate::pgp;
 use crate::securejoin::handle_degrade_event;
-use crate::wrapmime;

 #[derive(Debug)]
 pub struct EncryptHelper {
    pub prefer_encrypt: EncryptPreference,
    pub addr: String,
-    pub public_key: Key,
+    pub public_key: SignedPublicKey,
 }

 impl EncryptHelper {
@@ -98,14 +100,13 @@ impl EncryptHelper {
            .iter()
            .filter_map(|(state, addr)| state.as_ref().map(|s| (s, addr)))
        {
-            info!(context, "adding for {}: {:?}", addr, peerstate);
            let key = peerstate.peek_key(min_verified).ok_or_else(|| {
                format_err!("proper enc-key for {} missing, cannot encrypt", addr)
            })?;
            keyring.add_ref(key);
        }
-
-        keyring.add_ref(&self.public_key);
+        let public_key = Key::from(self.public_key.clone());
+        keyring.add_ref(&public_key);
        let sign_key = Key::from_self_private(context, self.addr.clone(), &context.sql)
            .ok_or_else(|| format_err!("missing own private key"))?;

@@ -119,14 +120,12 @@ impl EncryptHelper {

 pub fn try_decrypt(
    context: &Context,
-    mail: &mailparse::ParsedMail<'_>,
+    mail: &ParsedMail<'_>,
    message_time: i64,
 ) -> Result<(Option<Vec<u8>>, HashSet<String>)> {
-    info!(context, "trying to decrypt");
-
    let from = mail
        .headers
-        .get_first_value("From")?
+        .get_header_value(HeaderDef::From_)?
        .and_then(|from_addr| mailparse::addrparse(&from_addr).ok())
        .and_then(|from| from.extract_single_info())
        .map(|from| from.addr)
@@ -195,15 +194,20 @@ pub fn try_decrypt(
 /// storing a new one when one doesn't exist yet.  Care is taken to
 /// only generate one key per context even when multiple threads call
 /// this function concurrently.
-fn load_or_generate_self_public_key(context: &Context, self_addr: impl AsRef<str>) -> Result<Key> {
+fn load_or_generate_self_public_key(
+    context: &Context,
+    self_addr: impl AsRef<str>,
+) -> Result<SignedPublicKey> {
    if let Some(key) = Key::from_self_public(context, &self_addr, &context.sql) {
-        return Ok(key);
+        return SignedPublicKey::try_from(key)
+            .map_err(|_| Error::Message("Not a public key".into()));
    }
    let _guard = context.generating_key_mutex.lock().unwrap();

    // Check again in case the key was generated while we were waiting for the lock.
    if let Some(key) = Key::from_self_public(context, &self_addr, &context.sql) {
-        return Ok(key);
+        return SignedPublicKey::try_from(key)
+            .map_err(|_| Error::Message("Not a public key".into()));
    }

    let start = std::time::Instant::now();
@@ -211,34 +215,46 @@ fn load_or_generate_self_public_key(context: &Context, self_addr: impl AsRef<str
        context,
        "Generating keypair with {} bits, e={} ...", 2048, 65537,
    );
-    match pgp::create_keypair(&self_addr) {
-        Some((public_key, private_key)) => {
-            match dc_key_save_self_keypair(
-                context,
-                &public_key,
-                &private_key,
-                &self_addr,
-                true,
-                &context.sql,
-            ) {
-                true => {
-                    info!(
-                        context,
-                        "Keypair generated in {:.3}s.",
-                        start.elapsed().as_secs()
-                    );
-                    Ok(public_key)
-                }
-                false => Err(format_err!("Failed to save keypair")),
-            }
-        }
-        None => Err(format_err!("Failed to generate keypair")),
-    }
+    let keypair = pgp::create_keypair(EmailAddress::new(self_addr.as_ref())?)?;
+    key::store_self_keypair(context, &keypair, KeyPairUse::Default)?;
+    info!(
+        context,
+        "Keypair generated in {:.3}s.",
+        start.elapsed().as_secs()
+    );
+    Ok(keypair.public)
+}
+
+/// Returns a reference to the encrypted payload and validates the autocrypt structure.
+fn get_autocrypt_mime<'a, 'b>(mail: &'a ParsedMail<'b>) -> Result<&'a ParsedMail<'b>> {
+    ensure!(
+        mail.ctype.mimetype == "multipart/encrypted",
+        "Not a multipart/encrypted message: {}",
+        mail.ctype.mimetype
+    );
+    ensure!(
+        mail.subparts.len() == 2,
+        "Invalid Autocrypt Level 1 Mime Parts"
+    );
+
+    ensure!(
+        mail.subparts[0].ctype.mimetype == "application/pgp-encrypted",
+        "Invalid Autocrypt Level 1 version part: {:?}",
+        mail.subparts[0].ctype,
+    );
+
+    ensure!(
+        mail.subparts[1].ctype.mimetype == "application/octet-stream",
+        "Invalid Autocrypt Level 1 encrypted part: {:?}",
+        mail.subparts[1].ctype
+    );
+
+    Ok(&mail.subparts[1])
 }

 fn decrypt_if_autocrypt_message<'a>(
    context: &Context,
-    mail: &mailparse::ParsedMail<'a>,
+    mail: &ParsedMail<'a>,
    private_keyring: &Keyring,
    public_keyring_for_validate: &Keyring,
    ret_valid_signatures: &mut HashSet<String>,
@@ -250,14 +266,14 @@ fn decrypt_if_autocrypt_message<'a>(
    //
    // Errors are returned for failures related to decryption of AC-messages.

-    let encrypted_data_part = match wrapmime::get_autocrypt_mime(mail) {
-        Err(err) => {
-            // not a proper autocrypt message, abort and ignore
-            warn!(context, "Invalid autocrypt message: {:?}", err);
+    let encrypted_data_part = match get_autocrypt_mime(mail) {
+        Err(_) => {
+            // not an autocrypt mime message, abort and ignore
            return Ok(None);
        }
        Ok(res) => res,
    };
+    info!(context, "Detected Autocrypt-mime message");

    decrypt_part(
        context,
@@ -270,13 +286,12 @@ fn decrypt_if_autocrypt_message<'a>(

 /// Returns Ok(None) if nothing encrypted was found.
 fn decrypt_part(
-    context: &Context,
-    mail: &mailparse::ParsedMail<'_>,
+    _context: &Context,
+    mail: &ParsedMail<'_>,
    private_keyring: &Keyring,
    public_keyring_for_validate: &Keyring,
    ret_valid_signatures: &mut HashSet<String>,
 ) -> Result<Option<Vec<u8>>> {
-    info!(context, "decrypting part");
    let data = mail.get_body_raw()?;

    if has_decrypted_pgp_armor(&data) {
@@ -318,7 +333,7 @@ fn has_decrypted_pgp_armor(input: &[u8]) -> bool {
 /// However, Delta Chat itself has no problem with encrypted multipart/report
 /// parts and MUAs should be encouraged to encrpyt multipart/reports as well so
 /// that we could use the normal Autocrypt processing.
-fn contains_report(mail: &mailparse::ParsedMail<'_>) -> bool {
+fn contains_report(mail: &ParsedMail<'_>) -> bool {
    mail.ctype.mimetype == "multipart/report"
 }

--- a/src/error.rs
+++ b/src/error.rs
@@ -1,38 +1,62 @@
-use failure::Fail;
+//! # Error handling
+
 use lettre_email::mime;

 #[derive(Debug, Fail)]
 pub enum Error {
    #[fail(display = "{:?}", _0)]
    Failure(failure::Error),
+
    #[fail(display = "SQL error: {:?}", _0)]
    SqlError(#[cause] crate::sql::Error),
+
    #[fail(display = "{:?}", _0)]
    Io(std::io::Error),
+
    #[fail(display = "{:?}", _0)]
    Message(String),
+
+    #[fail(display = "{:?}", _0)]
+    MessageWithCause(String, #[cause] failure::Error, failure::Backtrace),
+
    #[fail(display = "{:?}", _0)]
    Image(image_meta::ImageError),
+
    #[fail(display = "{:?}", _0)]
    Utf8(std::str::Utf8Error),
+
    #[fail(display = "PGP: {:?}", _0)]
    Pgp(pgp::errors::Error),
+
    #[fail(display = "Base64Decode: {:?}", _0)]
    Base64Decode(base64::DecodeError),
+
    #[fail(display = "{:?}", _0)]
    FromUtf8(std::string::FromUtf8Error),
+
    #[fail(display = "{}", _0)]
    BlobError(#[cause] crate::blob::BlobError),
+
    #[fail(display = "Invalid Message ID.")]
    InvalidMsgId,
+
    #[fail(display = "Watch folder not found {:?}", _0)]
    WatchFolderNotFound(String),
-    #[fail(display = "Inalid Email: {:?}", _0)]
+
+    #[fail(display = "Invalid Email: {:?}", _0)]
    MailParseError(#[cause] mailparse::MailParseError),
+
    #[fail(display = "Building invalid Email: {:?}", _0)]
    LettreError(#[cause] lettre_email::error::Error),
+
+    #[fail(display = "SMTP error: {:?}", _0)]
+    SmtpError(#[cause] async_smtp::error::Error),
+
    #[fail(display = "FromStr error: {:?}", _0)]
    FromStr(#[cause] mime::FromStrError),
+
+    #[fail(display = "Not Configured")]
+    NotConfigured,
 }

 pub type Result<T> = std::result::Result<T, Error>;
@@ -97,6 +121,18 @@ impl From<crate::message::InvalidMsgId> for Error {
    }
 }

+impl From<crate::key::SaveKeyError> for Error {
+    fn from(err: crate::key::SaveKeyError) -> Error {
+        Error::MessageWithCause(format!("{}", err), err.into(), failure::Backtrace::new())
+    }
+}
+
+impl From<crate::pgp::PgpKeygenError> for Error {
+    fn from(err: crate::pgp::PgpKeygenError) -> Error {
+        Error::MessageWithCause(format!("{}", err), err.into(), failure::Backtrace::new())
+    }
+}
+
 impl From<mailparse::MailParseError> for Error {
    fn from(err: mailparse::MailParseError) -> Error {
        Error::MailParseError(err)
--- a/src/events.rs
+++ b/src/events.rs
@@ -1,7 +1,10 @@
+//! # Events specification
+
 use std::path::PathBuf;

 use strum::EnumProperty;

+use crate::chat::ChatId;
 use crate::message::MsgId;

 impl Event {
@@ -19,56 +22,38 @@ pub enum Event {
    /// The library-user may write an informational string to the log.
    /// Passed to the callback given to dc_context_new().
    /// This event should not be reported to the end-user using a popup or something like that.
-    ///
-    /// @return 0
    #[strum(props(id = "100"))]
    Info(String),

    /// Emitted when SMTP connection is established and login was successful.
-    ///
-    /// @return 0
    #[strum(props(id = "101"))]
    SmtpConnected(String),

    /// Emitted when IMAP connection is established and login was successful.
-    ///
-    /// @return 0
    #[strum(props(id = "102"))]
    ImapConnected(String),

    /// Emitted when a message was successfully sent to the SMTP server.
-    ///
-    /// @return 0
    #[strum(props(id = "103"))]
    SmtpMessageSent(String),

    /// Emitted when an IMAP message has been marked as deleted
-    ///
-    /// @return 0
    #[strum(props(id = "104"))]
    ImapMessageDeleted(String),

    /// Emitted when an IMAP message has been moved
-    ///
-    /// @return 0
    #[strum(props(id = "105"))]
    ImapMessageMoved(String),

    /// Emitted when an IMAP folder was emptied
-    ///
-    /// @return 0
    #[strum(props(id = "106"))]
    ImapFolderEmptied(String),

    /// Emitted when an new file in the $BLOBDIR was created
-    ///
-    /// @return 0
    #[strum(props(id = "150"))]
    NewBlobFile(String),

    /// Emitted when an new file in the $BLOBDIR was created
-    ///
-    /// @return 0
    #[strum(props(id = "151"))]
    DeletedBlobFile(String),

@@ -76,8 +61,6 @@ pub enum Event {
    /// Passed to the callback given to dc_context_new().
    ///
    /// This event should not be reported to the end-user using a popup or something like that.
-    ///
-    /// @return 0
    #[strum(props(id = "300"))]
    Warning(String),

@@ -90,10 +73,8 @@ pub enum Event {
    /// However, for ongoing processes (eg. configure())
    /// or for functions that are expected to fail (eg. dc_continue_key_transfer())
    /// it might be better to delay showing these events until the function has really
-    /// failed (returned false). It should be sufficient to report only the _last_ error
+    /// failed (returned false). It should be sufficient to report only the *last* error
    /// in a messasge box then.
-    ///
-    /// @return
    #[strum(props(id = "400"))]
    Error(String),

@@ -110,8 +91,6 @@ pub enum Event {
    /// Moreover, if the UI detects that the device is offline,
    /// it is probably more useful to report this to the user
    /// instead of the string from data2.
-    ///
-    /// @return 0
    #[strum(props(id = "401"))]
    ErrorNetwork(String),

@@ -120,8 +99,6 @@ pub enum Event {
    /// dc_set_chat_name(), dc_set_chat_profile_image(),
    /// dc_add_contact_to_chat(), dc_remove_contact_from_chat(),
    /// dc_send_text_msg() or another sending function.
-    ///
-    /// @return 0
    #[strum(props(id = "410"))]
    ErrorSelfNotInGroup(String),

@@ -130,54 +107,41 @@ pub enum Event {
    /// - Messages sent, received or removed
    /// - Chats created, deleted or archived
    /// - A draft has been set
-    ///
-    /// @return 0
    #[strum(props(id = "2000"))]
-    MsgsChanged { chat_id: u32, msg_id: MsgId },
+    MsgsChanged { chat_id: ChatId, msg_id: MsgId },

    /// There is a fresh message. Typically, the user will show an notification
    /// when receiving this message.
    ///
    /// There is no extra #DC_EVENT_MSGS_CHANGED event send together with this event.
-    ///
-    /// @return 0
    #[strum(props(id = "2005"))]
-    IncomingMsg { chat_id: u32, msg_id: MsgId },
+    IncomingMsg { chat_id: ChatId, msg_id: MsgId },

    /// A single message is sent successfully. State changed from  DC_STATE_OUT_PENDING to
    /// DC_STATE_OUT_DELIVERED, see dc_msg_get_state().
-    ///
-    /// @return 0
    #[strum(props(id = "2010"))]
-    MsgDelivered { chat_id: u32, msg_id: MsgId },
+    MsgDelivered { chat_id: ChatId, msg_id: MsgId },

    /// A single message could not be sent. State changed from DC_STATE_OUT_PENDING or DC_STATE_OUT_DELIVERED to
    /// DC_STATE_OUT_FAILED, see dc_msg_get_state().
-    ///
-    /// @return 0
    #[strum(props(id = "2012"))]
-    MsgFailed { chat_id: u32, msg_id: MsgId },
+    MsgFailed { chat_id: ChatId, msg_id: MsgId },

    /// A single message is read by the receiver. State changed from DC_STATE_OUT_DELIVERED to
    /// DC_STATE_OUT_MDN_RCVD, see dc_msg_get_state().
-    ///
-    /// @return 0
    #[strum(props(id = "2015"))]
-    MsgRead { chat_id: u32, msg_id: MsgId },
+    MsgRead { chat_id: ChatId, msg_id: MsgId },

    /// Chat changed.  The name or the image of a chat group was changed or members were added or removed.
    /// Or the verify state of a chat has changed.
    /// See dc_set_chat_name(), dc_set_chat_profile_image(), dc_add_contact_to_chat()
    /// and dc_remove_contact_from_chat().
-    ///
-    /// @return 0
    #[strum(props(id = "2020"))]
-    ChatModified(u32),
+    ChatModified(ChatId),

    /// Contact(s) created, renamed, blocked or deleted.
    ///
    /// @param data1 (int) If set, this is the contact_id of an added contact that should be selected.
-    /// @return 0
    #[strum(props(id = "2030"))]
    ContactsChanged(Option<u32>),

@@ -186,14 +150,12 @@ pub enum Event {
    /// @param data1 (u32) contact_id of the contact for which the location has changed.
    ///     If the locations of several contacts have been changed,
    ///     eg. after calling dc_delete_all_locations(), this parameter is set to `None`.
-    /// @return 0
    #[strum(props(id = "2035"))]
    LocationChanged(Option<u32>),

    /// Inform about the configuration progress started by configure().
    ///
    /// @param data1 (usize) 0=error, 1-999=progress in permille, 1000=success and done
-    /// @return 0
    #[strum(props(id = "2041"))]
    ConfigureProgress(usize),

@@ -201,7 +163,6 @@ pub enum Event {
    ///
    /// @param data1 (usize) 0=error, 1-999=progress in permille, 1000=success and done
    /// @param data2 0
-    /// @return 0
    #[strum(props(id = "2051"))]
    ImexProgress(usize),

@@ -212,7 +173,6 @@ pub enum Event {
    /// services.
    ///
    /// @param data2 0
-    /// @return 0
    #[strum(props(id = "2052"))]
    ImexFileWritten(PathBuf),

@@ -228,7 +188,6 @@ pub enum Event {
    ///     600=vg-/vc-request-with-auth received, vg-member-added/vc-contact-confirm sent, typically shown as "bob@addr verified".
    ///     800=vg-member-added-received received, shown as "bob@addr securely joined GROUP", only sent for the verified-group-protocol.
    ///     1000=Protocol finished for this contact.
-    /// @return 0
    #[strum(props(id = "2060"))]
    SecurejoinInviterProgress { contact_id: u32, progress: usize },

@@ -240,14 +199,12 @@ pub enum Event {
    /// @param data2 (int) Progress as:
    ///     400=vg-/vc-request-with-auth sent, typically shown as "alice@addr verified, introducing myself."
    ///     (Bob has verified alice and waits until Alice does the same for him)
-    /// @return 0
    #[strum(props(id = "2061"))]
    SecurejoinJoinerProgress { contact_id: u32, progress: usize },

    /// This event is sent out to the inviter when a joiner successfully joined a group.
    /// @param data1 (int) chat_id
    /// @param data2 (int) contact_id
-    /// @return 0
    #[strum(props(id = "2062"))]
-    SecurejoinMemberAdded { chat_id: u32, contact_id: u32 },
+    SecurejoinMemberAdded { chat_id: ChatId, contact_id: u32 },
 }
--- a/src/headerdef.rs
+++ b/src/headerdef.rs
@@ -0,0 +1,97 @@
+use crate::strum::AsStaticRef;
+use mailparse::{MailHeader, MailHeaderMap, MailParseError};
+
+#[derive(Debug, Display, Clone, PartialEq, Eq, EnumVariantNames, AsStaticStr)]
+#[strum(serialize_all = "kebab_case")]
+#[allow(dead_code)]
+pub enum HeaderDef {
+    MessageId,
+    Subject,
+    Date,
+    From_,
+    To,
+    Cc,
+    Disposition,
+    OriginalMessageId,
+
+    /// Delta Chat extension for message IDs in combined MDNs
+    AdditionalMessageIds,
+
+    ListId,
+    References,
+    InReplyTo,
+    Precedence,
+    ChatVersion,
+    ChatGroupId,
+    ChatGroupName,
+    ChatGroupNameChanged,
+    ChatVerified,
+    ChatGroupImage, // deprecated
+    ChatGroupAvatar,
+    ChatUserAvatar,
+    ChatVoiceMessage,
+    ChatGroupMemberRemoved,
+    ChatGroupMemberAdded,
+    ChatContent,
+    ChatDuration,
+    ChatDispositionNotificationTo,
+    Autocrypt,
+    AutocryptSetupMessage,
+    SecureJoin,
+    SecureJoinGroup,
+    SecureJoinFingerprint,
+    SecureJoinInvitenumber,
+    SecureJoinAuth,
+    _TestHeader,
+}
+
+impl HeaderDef {
+    /// Returns the corresponding Event id.
+    pub fn get_headername(&self) -> &'static str {
+        self.as_static()
+    }
+}
+
+pub trait HeaderDefMap {
+    fn get_header_value(&self, headerdef: HeaderDef) -> Result<Option<String>, MailParseError>;
+}
+
+impl HeaderDefMap for [MailHeader<'_>] {
+    fn get_header_value(&self, headerdef: HeaderDef) -> Result<Option<String>, MailParseError> {
+        self.get_first_value(headerdef.get_headername())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    /// Test that kebab_case serialization works as expected
+    fn kebab_test() {
+        assert_eq!(HeaderDef::From_.get_headername(), "from");
+
+        assert_eq!(HeaderDef::_TestHeader.get_headername(), "test-header");
+    }
+
+    #[test]
+    /// Test that headers are parsed case-insensitively
+    fn test_get_header_value_case() {
+        let (headers, _) =
+            mailparse::parse_headers(b"fRoM: Bob\naUtoCryPt-SeTup-MessAge: v99").unwrap();
+        assert_eq!(
+            headers
+                .get_header_value(HeaderDef::AutocryptSetupMessage)
+                .unwrap(),
+            Some("v99".to_string())
+        );
+        assert_eq!(
+            headers.get_header_value(HeaderDef::From_).unwrap(),
+            Some("Bob".to_string())
+        );
+        assert_eq!(
+            headers.get_header_value(HeaderDef::Autocrypt).unwrap(),
+            None
+        );
+    }
+}
--- a/src/imap/idle.rs
+++ b/src/imap/idle.rs
@@ -0,0 +1,279 @@
+use super::Imap;
+
+use async_imap::extensions::idle::IdleResponse;
+use async_std::prelude::*;
+use async_std::task;
+use std::sync::atomic::Ordering;
+use std::time::{Duration, SystemTime};
+
+use crate::context::Context;
+use crate::imap_client::*;
+
+use super::select_folder;
+
+type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug, Fail)]
+pub enum Error {
+    #[fail(display = "IMAP IDLE protocol failed to init/complete")]
+    IdleProtocolFailed(#[cause] async_imap::error::Error),
+
+    #[fail(display = "IMAP IDLE protocol timed out")]
+    IdleTimeout(#[cause] async_std::future::TimeoutError),
+
+    #[fail(display = "IMAP server does not have IDLE capability")]
+    IdleAbilityMissing,
+
+    #[fail(display = "IMAP select folder error")]
+    SelectFolderError(#[cause] select_folder::Error),
+
+    #[fail(display = "IMAP error")]
+    ImapError(#[cause] async_imap::error::Error),
+
+    #[fail(display = "Setup handle error")]
+    SetupHandleError(#[cause] super::Error),
+}
+
+impl From<select_folder::Error> for Error {
+    fn from(err: select_folder::Error) -> Error {
+        Error::SelectFolderError(err)
+    }
+}
+
+impl Imap {
+    pub fn can_idle(&self) -> bool {
+        task::block_on(async move { self.config.read().await.can_idle })
+    }
+
+    pub fn idle(&self, context: &Context, watch_folder: Option<String>) -> Result<()> {
+        task::block_on(async move {
+            if !self.can_idle() {
+                return Err(Error::IdleAbilityMissing);
+            }
+
+            self.setup_handle_if_needed(context)
+                .await
+                .map_err(Error::SetupHandleError)?;
+
+            self.select_folder(context, watch_folder.clone()).await?;
+
+            let session = self.session.lock().await.take();
+            let timeout = Duration::from_secs(23 * 60);
+            if let Some(session) = session {
+                match session.idle() {
+                    // BEWARE: If you change the Secure branch you
+                    // typically also need to change the Insecure branch.
+                    IdleHandle::Secure(mut handle) => {
+                        if let Err(err) = handle.init().await {
+                            return Err(Error::IdleProtocolFailed(err));
+                        }
+
+                        let (idle_wait, interrupt) = handle.wait_with_timeout(timeout);
+                        *self.interrupt.lock().await = Some(interrupt);
+
+                        if self.skip_next_idle_wait.load(Ordering::SeqCst) {
+                            // interrupt_idle has happened before we
+                            // provided self.interrupt
+                            self.skip_next_idle_wait.store(false, Ordering::SeqCst);
+                            std::mem::drop(idle_wait);
+                            info!(context, "Idle wait was skipped");
+                        } else {
+                            info!(context, "Idle entering wait-on-remote state");
+                            match idle_wait.await {
+                                Ok(IdleResponse::NewData(_)) => {
+                                    info!(context, "Idle has NewData");
+                                }
+                                // TODO: idle_wait does not distinguish manual interrupts
+                                // from Timeouts if we would know it's a Timeout we could bail
+                                // directly and reconnect .
+                                Ok(IdleResponse::Timeout) => {
+                                    info!(context, "Idle-wait timeout or interruption");
+                                }
+                                Ok(IdleResponse::ManualInterrupt) => {
+                                    info!(context, "Idle wait was interrupted");
+                                }
+                                Err(err) => {
+                                    warn!(context, "Idle wait errored: {:?}", err);
+                                }
+                            }
+                        }
+                        // if we can't properly terminate the idle
+                        // protocol let's break the connection.
+                        let res =
+                            async_std::future::timeout(Duration::from_secs(15), handle.done())
+                                .await
+                                .map_err(|err| {
+                                    self.trigger_reconnect();
+                                    Error::IdleTimeout(err)
+                                })?;
+
+                        match res {
+                            Ok(session) => {
+                                *self.session.lock().await = Some(Session::Secure(session));
+                            }
+                            Err(err) => {
+                                // if we cannot terminate IDLE it probably
+                                // means that we waited long (with idle_wait)
+                                // but the network went away/changed
+                                self.trigger_reconnect();
+                                return Err(Error::IdleProtocolFailed(err));
+                            }
+                        }
+                    }
+                    IdleHandle::Insecure(mut handle) => {
+                        if let Err(err) = handle.init().await {
+                            return Err(Error::IdleProtocolFailed(err));
+                        }
+
+                        let (idle_wait, interrupt) = handle.wait_with_timeout(timeout);
+                        *self.interrupt.lock().await = Some(interrupt);
+
+                        if self.skip_next_idle_wait.load(Ordering::SeqCst) {
+                            // interrupt_idle has happened before we
+                            // provided self.interrupt
+                            self.skip_next_idle_wait.store(false, Ordering::SeqCst);
+                            std::mem::drop(idle_wait);
+                            info!(context, "Idle wait was skipped");
+                        } else {
+                            info!(context, "Idle entering wait-on-remote state");
+                            match idle_wait.await {
+                                Ok(IdleResponse::NewData(_)) => {
+                                    info!(context, "Idle has NewData");
+                                }
+                                // TODO: idle_wait does not distinguish manual interrupts
+                                // from Timeouts if we would know it's a Timeout we could bail
+                                // directly and reconnect .
+                                Ok(IdleResponse::Timeout) => {
+                                    info!(context, "Idle-wait timeout or interruption");
+                                }
+                                Ok(IdleResponse::ManualInterrupt) => {
+                                    info!(context, "Idle wait was interrupted");
+                                }
+                                Err(err) => {
+                                    warn!(context, "Idle wait errored: {:?}", err);
+                                }
+                            }
+                        }
+                        // if we can't properly terminate the idle
+                        // protocol let's break the connection.
+                        let res =
+                            async_std::future::timeout(Duration::from_secs(15), handle.done())
+                                .await
+                                .map_err(|err| {
+                                    self.trigger_reconnect();
+                                    Error::IdleTimeout(err)
+                                })?;
+
+                        match res {
+                            Ok(session) => {
+                                *self.session.lock().await = Some(Session::Insecure(session));
+                            }
+                            Err(err) => {
+                                // if we cannot terminate IDLE it probably
+                                // means that we waited long (with idle_wait)
+                                // but the network went away/changed
+                                self.trigger_reconnect();
+                                return Err(Error::IdleProtocolFailed(err));
+                            }
+                        }
+                    }
+                }
+            }
+
+            Ok(())
+        })
+    }
+
+    pub(crate) fn fake_idle(&self, context: &Context, watch_folder: Option<String>) {
+        // Idle using polling. This is also needed if we're not yet configured -
+        // in this case, we're waiting for a configure job (and an interrupt).
+        task::block_on(async move {
+            let fake_idle_start_time = SystemTime::now();
+
+            info!(context, "IMAP-fake-IDLEing...");
+
+            let interrupt = stop_token::StopSource::new();
+
+            // check every minute if there are new messages
+            // TODO: grow sleep durations / make them more flexible
+            let interval = async_std::stream::interval(Duration::from_secs(60));
+            let mut interrupt_interval = interrupt.stop_token().stop_stream(interval);
+            *self.interrupt.lock().await = Some(interrupt);
+            if self.skip_next_idle_wait.load(Ordering::SeqCst) {
+                // interrupt_idle has happened before we
+                // provided self.interrupt
+                self.skip_next_idle_wait.store(false, Ordering::SeqCst);
+                info!(context, "fake-idle wait was skipped");
+            } else {
+                // loop until we are interrupted or if we fetched something
+                while let Some(_) = interrupt_interval.next().await {
+                    // try to connect with proper login params
+                    // (setup_handle_if_needed might not know about them if we
+                    // never successfully connected)
+                    if let Err(err) = self.connect_configured(context) {
+                        warn!(context, "fake_idle: could not connect: {}", err);
+                        continue;
+                    }
+                    if self.config.read().await.can_idle {
+                        // we only fake-idled because network was gone during IDLE, probably
+                        break;
+                    }
+                    info!(context, "fake_idle is connected");
+                    // we are connected, let's see if fetching messages results
+                    // in anything.  If so, we behave as if IDLE had data but
+                    // will have already fetched the messages so perform_*_fetch
+                    // will not find any new.
+
+                    if let Some(ref watch_folder) = watch_folder {
+                        match self.fetch_new_messages(context, watch_folder).await {
+                            Ok(res) => {
+                                info!(context, "fetch_new_messages returned {:?}", res);
+                                if res {
+                                    break;
+                                }
+                            }
+                            Err(err) => {
+                                error!(context, "could not fetch from folder: {}", err);
+                                self.trigger_reconnect()
+                            }
+                        }
+                    }
+                }
+            }
+            self.interrupt.lock().await.take();
+
+            info!(
+                context,
+                "IMAP-fake-IDLE done after {:.4}s",
+                SystemTime::now()
+                    .duration_since(fake_idle_start_time)
+                    .unwrap_or_default()
+                    .as_millis() as f64
+                    / 1000.,
+            );
+        })
+    }
+
+    pub fn interrupt_idle(&self, context: &Context) {
+        task::block_on(async move {
+            let mut interrupt: Option<stop_token::StopSource> = self.interrupt.lock().await.take();
+            if interrupt.is_none() {
+                // idle wait is not running, signal it needs to skip
+                self.skip_next_idle_wait.store(true, Ordering::SeqCst);
+
+                // meanwhile idle-wait may have produced the StopSource
+                interrupt = self.interrupt.lock().await.take();
+            }
+            // let's manually drop the StopSource
+            if interrupt.is_some() {
+                // the imap thread provided us a stop token but might
+                // not have entered idle_wait yet, give it some time
+                // for that to happen. XXX handle this without extra wait
+                // https://github.com/deltachat/deltachat-core-rust/issues/925
+                std::thread::sleep(Duration::from_millis(200));
+                info!(context, "low-level: dropping stop-source to interrupt idle");
+                std::mem::drop(interrupt)
+            }
+        });
+    }
+}
--- a/src/imap/mod.rs
+++ b/src/imap/mod.rs
--- a/src/imap/select_folder.rs
+++ b/src/imap/select_folder.rs
@@ -0,0 +1,113 @@
+use super::Imap;
+
+use crate::context::Context;
+
+type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug, Fail)]
+pub enum Error {
+    #[fail(display = "IMAP Could not obtain imap-session object.")]
+    NoSession,
+
+    #[fail(display = "IMAP Connection Lost or no connection established")]
+    ConnectionLost,
+
+    #[fail(display = "IMAP Folder name invalid: {:?}", _0)]
+    BadFolderName(String),
+
+    #[fail(display = "IMAP close/expunge failed: {}", _0)]
+    CloseExpungeFailed(#[cause] async_imap::error::Error),
+
+    #[fail(display = "IMAP other error: {:?}", _0)]
+    Other(String),
+}
+
+impl Imap {
+    /// select a folder, possibly update uid_validity and, if needed,
+    /// expunge the folder to remove delete-marked messages.
+    pub(super) async fn select_folder<S: AsRef<str>>(
+        &self,
+        context: &Context,
+        folder: Option<S>,
+    ) -> Result<()> {
+        if self.session.lock().await.is_none() {
+            let mut cfg = self.config.write().await;
+            cfg.selected_folder = None;
+            cfg.selected_folder_needs_expunge = false;
+            self.trigger_reconnect();
+            return Err(Error::NoSession);
+        }
+
+        // if there is a new folder and the new folder is equal to the selected one, there's nothing to do.
+        // if there is _no_ new folder, we continue as we might want to expunge below.
+        if let Some(ref folder) = folder {
+            if let Some(ref selected_folder) = self.config.read().await.selected_folder {
+                if folder.as_ref() == selected_folder {
+                    return Ok(());
+                }
+            }
+        }
+
+        // deselect existing folder, if needed (it's also done implicitly by SELECT, however, without EXPUNGE then)
+        let needs_expunge = { self.config.read().await.selected_folder_needs_expunge };
+        if needs_expunge {
+            if let Some(ref folder) = self.config.read().await.selected_folder {
+                info!(context, "Expunge messages in \"{}\".", folder);
+
+                // A CLOSE-SELECT is considerably faster than an EXPUNGE-SELECT, see
+                // https://tools.ietf.org/html/rfc3501#section-6.4.2
+                if let Some(ref mut session) = &mut *self.session.lock().await {
+                    match session.close().await {
+                        Ok(_) => {
+                            info!(context, "close/expunge succeeded");
+                        }
+                        Err(err) => {
+                            self.trigger_reconnect();
+                            return Err(Error::CloseExpungeFailed(err));
+                        }
+                    }
+                } else {
+                    return Err(Error::NoSession);
+                }
+            }
+            self.config.write().await.selected_folder_needs_expunge = false;
+        }
+
+        // select new folder
+        if let Some(ref folder) = folder {
+            if let Some(ref mut session) = &mut *self.session.lock().await {
+                let res = session.select(folder).await;
+
+                // https://tools.ietf.org/html/rfc3501#section-6.3.1
+                // says that if the server reports select failure we are in
+                // authenticated (not-select) state.
+
+                match res {
+                    Ok(mailbox) => {
+                        let mut config = self.config.write().await;
+                        config.selected_folder = Some(folder.as_ref().to_string());
+                        config.selected_mailbox = Some(mailbox);
+                        Ok(())
+                    }
+                    Err(async_imap::error::Error::ConnectionLost) => {
+                        self.trigger_reconnect();
+                        self.config.write().await.selected_folder = None;
+                        Err(Error::ConnectionLost)
+                    }
+                    Err(async_imap::error::Error::Validate(_)) => {
+                        Err(Error::BadFolderName(folder.as_ref().to_string()))
+                    }
+                    Err(err) => {
+                        self.config.write().await.selected_folder = None;
+                        self.trigger_reconnect();
+                        Err(Error::Other(err.to_string()))
+                    }
+                }
+            } else {
+                Err(Error::NoSession)
+            }
+        } else {
+            Ok(())
+        }
+    }
+}
--- a/src/imap_client.rs
+++ b/src/imap_client.rs
@@ -4,14 +4,11 @@ use async_imap::{
    types::{Capabilities, Fetch, Mailbox, Name},
    Client as ImapClient, Session as ImapSession,
 };
+use async_native_tls::TlsStream;
 use async_std::net::{self, TcpStream};
 use async_std::prelude::*;
-use async_std::sync::Arc;
-use async_tls::client::TlsStream;

-use crate::login_param::{dc_build_tls_config, CertificateChecks};
-
-const DCC_IMAP_DEBUG: &str = "DCC_IMAP_DEBUG";
+use crate::login_param::{dc_build_tls, CertificateChecks};

 #[derive(Debug)]
 pub(crate) enum Client {
@@ -38,18 +35,17 @@ impl Client {
        certificate_checks: CertificateChecks,
    ) -> ImapResult<Self> {
        let stream = TcpStream::connect(addr).await?;
-        let tls_config = dc_build_tls_config(certificate_checks);
-        let tls_connector: async_tls::TlsConnector = Arc::new(tls_config).into();
-        let tls_stream = tls_connector.connect(domain.as_ref(), stream)?.await?;
+        let tls = dc_build_tls(certificate_checks);
+        let tls_stream = tls.connect(domain.as_ref(), stream).await?;
        let mut client = ImapClient::new(tls_stream);
-        if std::env::var(DCC_IMAP_DEBUG).is_ok() {
+        if std::env::var(crate::DCC_IMAP_DEBUG).is_ok() {
            client.debug = true;
        }

        let _greeting = client
            .read_response()
            .await
-            .expect("failed to read greeting");
+            .ok_or_else(|| ImapError::Bad("failed to read greeting".to_string()))?;

        Ok(Client::Secure(client))
    }
@@ -58,13 +54,13 @@ impl Client {
        let stream = TcpStream::connect(addr).await?;

        let mut client = ImapClient::new(stream);
-        if std::env::var(DCC_IMAP_DEBUG).is_ok() {
+        if std::env::var(crate::DCC_IMAP_DEBUG).is_ok() {
            client.debug = true;
        }
        let _greeting = client
            .read_response()
            .await
-            .expect("failed to read greeting");
+            .ok_or_else(|| ImapError::Bad("failed to read greeting".to_string()))?;

        Ok(Client::Insecure(client))
    }
@@ -76,10 +72,8 @@ impl Client {
    ) -> ImapResult<Client> {
        match self {
            Client::Insecure(client) => {
-                let tls_config = dc_build_tls_config(certificate_checks);
-                let tls: async_tls::TlsConnector = Arc::new(tls_config).into();
-
-                let client_sec = client.secure(domain, &tls).await?;
+                let tls = dc_build_tls(certificate_checks);
+                let client_sec = client.secure(domain, tls).await?;

                Ok(Client::Secure(client_sec))
            }
--- a/src/imex.rs
+++ b/src/imex.rs
@@ -8,6 +8,7 @@ use rand::{thread_rng, Rng};

 use crate::blob::BlobObject;
 use crate::chat;
+use crate::chat::delete_and_reset_all_device_msgs;
 use crate::config::Config;
 use crate::configure::*;
 use crate::constants::*;
@@ -17,7 +18,7 @@ use crate::e2ee;
 use crate::error::*;
 use crate::events::Event;
 use crate::job::*;
-use crate::key::*;
+use crate::key::{self, Key};
 use crate::message::{Message, MsgId};
 use crate::mimeparser::SystemMessage;
 use crate::param::*;
@@ -33,16 +34,19 @@ pub enum ImexMode {
    /// and `private-key-default.asc`, if there are more keys, they are written to files as
    /// `public-key-<id>.asc` and `private-key-<id>.asc`
    ExportSelfKeys = 1,
+
    /// Import private keys found in the directory given as `param1`.
    /// The last imported key is made the default keys unless its name contains the string `legacy`.
    /// Public keys are not imported.
    ImportSelfKeys = 2,
+
    /// Export a backup to the directory given as `param1`.
    /// The backup contains all contacts, chats, images and other data and device independent settings.
    /// The backup does not contain device dependent settings as ringtones or LED notification settings.
    /// The name of the backup is typically `delta-chat.<day>.bak`, if more than one backup is create on a day,
    /// the format is `delta-chat.<day>-<number>.bak`
    ExportBackup = 11,
+
    /// `param1` is the file (not: directory) to import. The file is normally
    /// created by DC_IMEX_EXPORT_BACKUP and detected by dc_imex_has_backup(). Importing a backup
    /// is only possible as long as the context is not configured or used in another way.
@@ -53,7 +57,7 @@ pub enum ImexMode {
 /// For this purpose, the function creates a job that is executed in the IMAP-thread then;
 /// this requires to call dc_perform_inbox_jobs() regularly.
 ///
-/// What to do is defined by the _what_ parameter.
+/// What to do is defined by the *what* parameter.
 ///
 /// While dc_imex() returns immediately, the started job may take a while,
 /// you can stop it using dc_stop_ongoing_process(). During execution of the job,
@@ -84,27 +88,24 @@ pub fn has_backup(context: &Context, dir_name: impl AsRef<Path>) -> Result<Strin
    let mut newest_backup_time = 0;
    let mut newest_backup_path: Option<std::path::PathBuf> = None;
    for dirent in dir_iter {
-        match dirent {
-            Ok(dirent) => {
-                let path = dirent.path();
-                let name = dirent.file_name();
-                let name = name.to_string_lossy();
-                if name.starts_with("delta-chat") && name.ends_with(".bak") {
-                    let sql = Sql::new();
-                    if sql.open(context, &path, true) {
-                        let curr_backup_time = sql
-                            .get_raw_config_int(context, "backup_time")
-                            .unwrap_or_default();
-                        if curr_backup_time > newest_backup_time {
-                            newest_backup_path = Some(path);
-                            newest_backup_time = curr_backup_time;
-                        }
-                        info!(context, "backup_time of {} is {}", name, curr_backup_time);
-                        sql.close(&context);
+        if let Ok(dirent) = dirent {
+            let path = dirent.path();
+            let name = dirent.file_name();
+            let name = name.to_string_lossy();
+            if name.starts_with("delta-chat") && name.ends_with(".bak") {
+                let sql = Sql::new();
+                if sql.open(context, &path, true) {
+                    let curr_backup_time = sql
+                        .get_raw_config_int(context, "backup_time")
+                        .unwrap_or_default();
+                    if curr_backup_time > newest_backup_time {
+                        newest_backup_path = Some(path);
+                        newest_backup_time = curr_backup_time;
                    }
+                    info!(context, "backup_time of {} is {}", name, curr_backup_time);
+                    sql.close(&context);
                }
            }
-            Err(_) => (),
        }
    }
    match newest_backup_path {
@@ -136,14 +137,16 @@ fn do_initiate_key_transfer(context: &Context) -> Result<String> {

    let chat_id = chat::create_by_contact_id(context, DC_CONTACT_ID_SELF)?;
    msg = Message::default();
-    msg.type_0 = Viewtype::File;
+    msg.viewtype = Viewtype::File;
    msg.param.set(Param::File, setup_file_blob.as_name());

    msg.param
        .set(Param::MimeType, "application/autocrypt-setup");
    msg.param.set_cmd(SystemMessage::AutocryptSetupMessage);
-    msg.param
-        .set_int(Param::ForcePlaintext, DC_FP_NO_AUTOCRYPT_HEADER);
+    msg.param.set_int(
+        Param::ForcePlaintext,
+        ForcePlaintext::NoAutocryptHeader as i32,
+    );

    ensure!(!context.shall_stop_ongoing(), "canceled");
    let msg_id = chat::send_msg(context, chat_id, &mut msg)?;
@@ -175,7 +178,7 @@ pub fn render_setup_file(context: &Context, passphrase: &str) -> Result<String>
    );
    let self_addr = e2ee::ensure_secret_key_exists(context)?;
    let private_key = Key::from_self_private(context, self_addr, &context.sql)
-        .ok_or(format_err!("Failed to get private key."))?;
+        .ok_or_else(|| format_err!("Failed to get private key."))?;
    let ac_headers = match context.get_config_bool(Config::E2eeEnabled) {
        false => None,
        true => Some(("Autocrypt-Prefer-Encrypt", "mutual")),
@@ -222,7 +225,7 @@ pub fn create_setup_code(_context: &Context) -> String {
    for i in 0..9 {
        loop {
            random_val = rng.gen();
-            if !(random_val as usize > 60000) {
+            if random_val as usize <= 60000 {
                break;
            }
        }
@@ -286,7 +289,6 @@ fn set_self_key(
        .and_then(|(k, h)| k.split_key().map(|pub_key| (k, pub_key, h)));

    ensure!(keys.is_some(), "Not a valid private key");
-
    let (private_key, public_key, header) = keys.unwrap();
    let preferencrypt = header.get("Autocrypt-Prefer-Encrypt");
    match preferencrypt.map(|s| s.as_str()) {
@@ -311,34 +313,26 @@ fn set_self_key(

    let self_addr = context.get_config(Config::ConfiguredAddr);
    ensure!(self_addr.is_some(), "Missing self addr");
+    let addr = EmailAddress::new(&self_addr.unwrap_or_default())?;

-    // XXX maybe better make dc_key_save_self_keypair delete things
-    sql::execute(
+    let (public, secret) = match (public_key, private_key) {
+        (Key::Public(p), Key::Secret(s)) => (p, s),
+        _ => bail!("wrong keys unpacked"),
+    };
+    let keypair = pgp::KeyPair {
+        addr,
+        public,
+        secret,
+    };
+    key::store_self_keypair(
        context,
-        &context.sql,
-        "DELETE FROM keypairs WHERE public_key=? OR private_key=?;",
-        params![public_key.to_bytes(), private_key.to_bytes()],
+        &keypair,
+        if set_default {
+            key::KeyPairUse::Default
+        } else {
+            key::KeyPairUse::ReadOnly
+        },
    )?;
-
-    if set_default {
-        sql::execute(
-            context,
-            &context.sql,
-            "UPDATE keypairs SET is_default=0;",
-            params![],
-        )?;
-    }
-
-    if !dc_key_save_self_keypair(
-        context,
-        &public_key,
-        &private_key,
-        self_addr.unwrap_or_default(),
-        set_default,
-        &context.sql,
-    ) {
-        bail!("Cannot save keypair, internal key-state possibly corrupted now!");
-    }
    Ok(())
 }

@@ -383,7 +377,7 @@ pub fn JobImexImap(context: &Context, job: &Job) -> Result<()> {
            context.free_ongoing();
            bail!("Cannot create private key or private key not available.");
        } else {
-            dc_create_folder(context, &param);
+            dc_create_folder(context, &param)?;
        }
    }
    let path = Path::new(param);
@@ -441,6 +435,8 @@ fn import_backup(context: &Context, backup_to_import: impl AsRef<Path>) -> Resul
        "could not re-open db"
    );

+    delete_and_reset_all_device_msgs(&context)?;
+
    let total_files_cnt = context
        .sql
        .query_get_value::<_, isize>(context, "SELECT COUNT(*) FROM backup_blobs;", params![])
@@ -548,7 +544,7 @@ fn export_backup(context: &Context, dir: impl AsRef<Path>) -> Result<()> {
        }
        Ok(()) => {
            dest_sql.set_raw_config_int(context, "backup_time", now as i32)?;
-            context.call_cb(Event::ImexFileWritten(dest_path_filename.clone()));
+            context.call_cb(Event::ImexFileWritten(dest_path_filename));
            Ok(())
        }
    };
@@ -741,7 +737,6 @@ fn export_key_to_asc_file(
 #[cfg(test)]
 mod tests {
    use super::*;
-
    use crate::pgp::{split_armored_data, HEADER_AUTOCRYPT, HEADER_SETUPCODE};
    use crate::test_utils::*;
    use ::pgp::armor::BlockType;
@@ -796,8 +791,7 @@ mod tests {
    #[test]
    fn test_export_key_to_asc_file() {
        let context = dummy_context();
-        let base64 = include_str!("../test-data/key/public.asc");
-        let key = Key::from_base64(base64, KeyType::Public).unwrap();
+        let key = Key::from(alice_keypair().public);
        let blobdir = "$BLOBDIR";
        assert!(export_key_to_asc_file(&context.ctx, blobdir, None, &key).is_ok());
        let blobdir = context.ctx.get_blobdir().to_str().unwrap();
--- a/src/job.rs
+++ b/src/job.rs
--- a/src/job_thread.rs
+++ b/src/job_thread.rs
@@ -73,7 +73,7 @@ impl JobThread {
        info!(context, "Interrupting {}-IDLE... finished", self.name);
    }

-    pub fn fetch(&mut self, context: &Context, use_network: bool) {
+    pub async fn fetch(&mut self, context: &Context, use_network: bool) {
        {
            let &(ref lock, _) = &*self.state.clone();
            let mut state = lock.lock().unwrap();
@@ -86,10 +86,10 @@ impl JobThread {
        }

        if use_network {
-            if let Err(err) = self.connect_and_fetch(context) {
+            if let Err(err) = self.connect_and_fetch(context).await {
                warn!(context, "connect+fetch failed: {}, reconnect & retry", err);
                self.imap.trigger_reconnect();
-                if let Err(err) = self.connect_and_fetch(context) {
+                if let Err(err) = self.connect_and_fetch(context).await {
                    warn!(context, "connect+fetch failed: {}", err);
                }
            }
@@ -97,14 +97,18 @@ impl JobThread {
        self.state.0.lock().unwrap().using_handle = false;
    }

-    fn connect_and_fetch(&mut self, context: &Context) -> Result<()> {
+    async fn connect_and_fetch(&mut self, context: &Context) -> Result<()> {
        let prefix = format!("{}-fetch", self.name);
        match self.imap.connect_configured(context) {
            Ok(()) => {
                if let Some(watch_folder) = self.get_watch_folder(context) {
                    let start = std::time::Instant::now();
                    info!(context, "{} started...", prefix);
-                    let res = self.imap.fetch(context, &watch_folder).map_err(Into::into);
+                    let res = self
+                        .imap
+                        .fetch(context, &watch_folder)
+                        .await
+                        .map_err(Into::into);
                    let elapsed = start.elapsed().as_millis();
                    info!(context, "{} done in {:.3} ms.", prefix, elapsed);

@@ -139,7 +143,7 @@ impl JobThread {
            if state.jobs_needed {
                info!(
                    context,
-                    "{}-IDLE will not be started as it was interrupted while not ideling.",
+                    "{}-IDLE will not be started as it was interrupted while not idling.",
                    self.name,
                );
                state.jobs_needed = false;
@@ -170,20 +174,19 @@ impl JobThread {
        let prefix = format!("{}-IDLE", self.name);
        let do_fake_idle = match self.imap.connect_configured(context) {
            Ok(()) => {
-                info!(context, "{} started...", prefix);
-                let watch_folder = self.get_watch_folder(context);
-                let res = self.imap.idle(context, watch_folder);
-                info!(context, "{} ended...", prefix);
-                match res {
-                    Ok(()) => false,
-                    Err(crate::imap::Error::IdleAbilityMissing) => true, // we have to do fake_idle
-                    Err(err) => {
+                if !self.imap.can_idle() {
+                    true // we have to do fake_idle
+                } else {
+                    let watch_folder = self.get_watch_folder(context);
+                    info!(context, "{} started...", prefix);
+                    let res = self.imap.idle(context, watch_folder);
+                    info!(context, "{} ended...", prefix);
+                    if let Err(err) = res {
                        warn!(context, "{} failed: {} -> reconnecting", prefix, err);
                        // something is borked, let's start afresh on the next occassion
                        self.imap.disconnect(context);
-
-                        false
                    }
+                    false
                }
            }
            Err(err) => {
--- a/src/key.rs
+++ b/src/key.rs
@@ -4,14 +4,84 @@ use std::collections::BTreeMap;
 use std::io::Cursor;
 use std::path::Path;

-use pgp::composed::{Deserializable, SignedPublicKey, SignedSecretKey};
+use pgp::composed::Deserializable;
 use pgp::ser::Serialize;
 use pgp::types::{KeyTrait, SecretKeyTrait};

 use crate::constants::*;
 use crate::context::Context;
 use crate::dc_tools::*;
-use crate::sql::{self, Sql};
+use crate::sql::Sql;
+
+// Re-export key types
+pub use crate::pgp::KeyPair;
+pub use pgp::composed::{SignedPublicKey, SignedSecretKey};
+
+/// Error type for deltachat key handling.
+#[derive(Fail, Debug)]
+pub enum Error {
+    #[fail(display = "Could not decode base64")]
+    Base64Decode(#[cause] base64::DecodeError, failure::Backtrace),
+    #[fail(display = "rPGP error: {}", _0)]
+    PgpError(#[cause] pgp::errors::Error, failure::Backtrace),
+}
+
+impl From<base64::DecodeError> for Error {
+    fn from(err: base64::DecodeError) -> Error {
+        Error::Base64Decode(err, failure::Backtrace::new())
+    }
+}
+
+impl From<pgp::errors::Error> for Error {
+    fn from(err: pgp::errors::Error) -> Error {
+        Error::PgpError(err, failure::Backtrace::new())
+    }
+}
+
+pub type Result<T> = std::result::Result<T, Error>;
+
+/// Convenience trait for working with keys.
+///
+/// This trait is implemented for rPGP's [SignedPublicKey] and
+/// [SignedSecretKey] types and makes working with them a little
+/// easier in the deltachat world.
+pub trait DcKey: Serialize + Deserializable {
+    type KeyType: Serialize + Deserializable;
+
+    /// Create a key from some bytes.
+    fn from_slice(bytes: &[u8]) -> Result<Self::KeyType> {
+        Ok(<Self::KeyType as Deserializable>::from_bytes(Cursor::new(
+            bytes,
+        ))?)
+    }
+
+    /// Create a key from a base64 string.
+    fn from_base64(data: &str) -> Result<Self::KeyType> {
+        // strip newlines and other whitespace
+        let cleaned: String = data.trim().split_whitespace().collect();
+        let bytes = base64::decode(cleaned.as_bytes())?;
+        Self::from_slice(&bytes)
+    }
+
+    /// Serialise the key to a base64 string.
+    fn to_base64(&self) -> String {
+        // Not using Serialize::to_bytes() to make clear *why* it is
+        // safe to ignore this error.
+        // Because we write to a Vec<u8> the io::Write impls never
+        // fail and we can hide this error.
+        let mut buf = Vec::new();
+        self.to_writer(&mut buf).unwrap();
+        base64::encode(&buf)
+    }
+}
+
+impl DcKey for SignedPublicKey {
+    type KeyType = SignedPublicKey;
+}
+
+impl DcKey for SignedSecretKey {
+    type KeyType = SignedSecretKey;
+}

 /// Cryptographic key
 #[derive(Debug, PartialEq, Eq, Clone)]
@@ -35,7 +105,7 @@ impl From<SignedSecretKey> for Key {
 impl std::convert::TryFrom<Key> for SignedSecretKey {
    type Error = ();

-    fn try_from(value: Key) -> Result<Self, Self::Error> {
+    fn try_from(value: Key) -> std::result::Result<Self, Self::Error> {
        match value {
            Key::Public(_) => Err(()),
            Key::Secret(key) => Ok(key),
@@ -46,7 +116,7 @@ impl std::convert::TryFrom<Key> for SignedSecretKey {
 impl<'a> std::convert::TryFrom<&'a Key> for &'a SignedSecretKey {
    type Error = ();

-    fn try_from(value: &'a Key) -> Result<Self, Self::Error> {
+    fn try_from(value: &'a Key) -> std::result::Result<Self, Self::Error> {
        match value {
            Key::Public(_) => Err(()),
            Key::Secret(key) => Ok(key),
@@ -57,7 +127,7 @@ impl<'a> std::convert::TryFrom<&'a Key> for &'a SignedSecretKey {
 impl std::convert::TryFrom<Key> for SignedPublicKey {
    type Error = ();

-    fn try_from(value: Key) -> Result<Self, Self::Error> {
+    fn try_from(value: Key) -> std::result::Result<Self, Self::Error> {
        match value {
            Key::Public(key) => Ok(key),
            Key::Secret(_) => Err(()),
@@ -68,7 +138,7 @@ impl std::convert::TryFrom<Key> for SignedPublicKey {
 impl<'a> std::convert::TryFrom<&'a Key> for &'a SignedPublicKey {
    type Error = ();

-    fn try_from(value: &'a Key) -> Result<Self, Self::Error> {
+    fn try_from(value: &'a Key) -> std::result::Result<Self, Self::Error> {
        match value {
            Key::Public(key) => Ok(key),
            Key::Secret(_) => Err(()),
@@ -92,7 +162,7 @@ impl Key {
        if bytes.is_empty() {
            return None;
        }
-        let res: Result<Key, _> = match key_type {
+        let res: std::result::Result<Key, _> = match key_type {
            KeyType::Public => SignedPublicKey::from_bytes(Cursor::new(bytes)).map(Into::into),
            KeyType::Private => SignedSecretKey::from_bytes(Cursor::new(bytes)).map(Into::into),
        };
@@ -111,7 +181,7 @@ impl Key {
        key_type: KeyType,
    ) -> Option<(Self, BTreeMap<String, String>)> {
        let bytes = data.as_bytes();
-        let res: Result<(Key, _), _> = match key_type {
+        let res: std::result::Result<(Key, _), _> = match key_type {
            KeyType::Public => SignedPublicKey::from_armor_single(Cursor::new(bytes))
                .map(|(k, h)| (Into::into(k), h)),
            KeyType::Private => SignedSecretKey::from_armor_single(Cursor::new(bytes))
@@ -127,15 +197,6 @@ impl Key {
        }
    }

-    pub fn from_base64(encoded_data: &str, key_type: KeyType) -> Option<Self> {
-        // strip newlines and other whitespace
-        let cleaned: String = encoded_data.trim().split_whitespace().collect();
-        let bytes = cleaned.as_bytes();
-        base64::decode(bytes)
-            .ok()
-            .and_then(|decoded| Self::from_slice(&decoded, key_type))
-    }
-
    pub fn from_self_public(
        context: &Context,
        self_addr: impl AsRef<str>,
@@ -178,21 +239,9 @@ impl Key {
        }
    }

-    pub fn to_base64(&self, break_every: usize) -> String {
+    pub fn to_base64(&self) -> String {
        let buf = self.to_bytes();
-
-        let encoded = base64::encode(&buf);
-        encoded
-            .chars()
-            .enumerate()
-            .fold(String::new(), |mut res, (i, c)| {
-                if i > 0 && i % break_every == 0 {
-                    res.push(' ')
-                }
-                res.push(c);
-                res
-            })
-            .to_string()
+        base64::encode(&buf)
    }

    pub fn to_armored_string(
@@ -254,20 +303,97 @@ impl Key {
    }
 }

-pub fn dc_key_save_self_keypair(
+/// Use of a [KeyPair] for encryption or decryption.
+///
+/// This is used by [store_self_keypair] to know what kind of key is
+/// being saved.
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum KeyPairUse {
+    /// The default key used to encrypt new messages.
+    Default,
+    /// Only used to decrypt existing message.
+    ReadOnly,
+}
+
+/// Error saving a keypair to the database.
+#[derive(Fail, Debug)]
+#[fail(display = "SaveKeyError: {}", message)]
+pub struct SaveKeyError {
+    message: String,
+    #[cause]
+    cause: failure::Error,
+    backtrace: failure::Backtrace,
+}
+
+impl SaveKeyError {
+    fn new(message: impl Into<String>, cause: impl Into<failure::Error>) -> Self {
+        Self {
+            message: message.into(),
+            cause: cause.into(),
+            backtrace: failure::Backtrace::new(),
+        }
+    }
+}
+
+/// Store the keypair as an owned keypair for addr in the database.
+///
+/// This will save the keypair as keys for the given address.  The
+/// "self" here refers to the fact that this DC instance owns the
+/// keypair.  Usually `addr` will be [Config::ConfiguredAddr].
+///
+/// If either the public or private keys are already present in the
+/// database, this entry will be removed first regardless of the
+/// address associated with it.  Practically this means saving the
+/// same key again overwrites it.
+///
+/// [Config::ConfiguredAddr]: crate::config::Config::ConfiguredAddr
+pub fn store_self_keypair(
    context: &Context,
-    public_key: &Key,
-    private_key: &Key,
-    addr: impl AsRef<str>,
-    is_default: bool,
-    sql: &Sql,
-) -> bool {
-    sql::execute(
-        context,
-        sql,
-        "INSERT INTO keypairs (addr, is_default, public_key, private_key, created) VALUES (?,?,?,?,?);",
-        params![addr.as_ref(), is_default as i32, public_key.to_bytes(), private_key.to_bytes(), time()],
-    ).is_ok()
+    keypair: &KeyPair,
+    default: KeyPairUse,
+) -> std::result::Result<(), SaveKeyError> {
+    // Everything should really be one transaction, more refactoring
+    // is needed for that.
+    let public_key = keypair
+        .public
+        .to_bytes()
+        .map_err(|err| SaveKeyError::new("failed to serialise public key", err))?;
+    let secret_key = keypair
+        .secret
+        .to_bytes()
+        .map_err(|err| SaveKeyError::new("failed to serialise secret key", err))?;
+    context
+        .sql
+        .execute(
+            "DELETE FROM keypairs WHERE public_key=? OR private_key=?;",
+            params![public_key, secret_key],
+        )
+        .map_err(|err| SaveKeyError::new("failed to remove old use of key", err))?;
+    if default == KeyPairUse::Default {
+        context
+            .sql
+            .execute("UPDATE keypairs SET is_default=0;", params![])
+            .map_err(|err| SaveKeyError::new("failed to clear default", err))?;
+    }
+    let is_default = match default {
+        KeyPairUse::Default => true,
+        KeyPairUse::ReadOnly => false,
+    };
+    context
+        .sql
+        .execute(
+            "INSERT INTO keypairs (addr, is_default, public_key, private_key, created)
+                VALUES (?,?,?,?,?);",
+            params![
+                keypair.addr.to_string(),
+                is_default as i32,
+                public_key,
+                secret_key,
+                time()
+            ],
+        )
+        .map(|_| ())
+        .map_err(|err| SaveKeyError::new("failed to insert keypair", err))
 }

 /// Make a fingerprint human-readable, in hex format.
@@ -299,6 +425,14 @@ pub fn dc_normalize_fingerprint(fp: &str) -> String {
 #[cfg(test)]
 mod tests {
    use super::*;
+    use crate::test_utils::*;
+    use std::convert::TryFrom;
+
+    use lazy_static::lazy_static;
+
+    lazy_static! {
+        static ref KEYPAIR: KeyPair = alice_keypair();
+    }

    #[test]
    fn test_normalize_fingerprint() {
@@ -385,9 +519,9 @@ i8pcjGO+IZffvyZJVRWfVooBJmWWbPB1pueo3tx8w3+fcuzpxz+RLFKaPyqXO+dD
    }

    #[test]
-    #[ignore] // is too expensive
    fn test_from_slice_roundtrip() {
-        let (public_key, private_key) = crate::pgp::create_keypair("hello").unwrap();
+        let public_key = Key::from(KEYPAIR.public.clone());
+        let private_key = Key::from(KEYPAIR.secret.clone());

        let binary = public_key.to_bytes();
        let public_key2 = Key::from_slice(&binary, KeyType::Public).expect("invalid public key");
@@ -420,9 +554,9 @@ i8pcjGO+IZffvyZJVRWfVooBJmWWbPB1pueo3tx8w3+fcuzpxz+RLFKaPyqXO+dD
    }

    #[test]
-    #[ignore] // is too expensive
    fn test_ascii_roundtrip() {
-        let (public_key, private_key) = crate::pgp::create_keypair("hello").unwrap();
+        let public_key = Key::from(KEYPAIR.public.clone());
+        let private_key = Key::from(KEYPAIR.secret.clone());

        let s = public_key.to_armored_string(None).unwrap();
        let (public_key2, _) =
@@ -435,4 +569,51 @@ i8pcjGO+IZffvyZJVRWfVooBJmWWbPB1pueo3tx8w3+fcuzpxz+RLFKaPyqXO+dD
            Key::from_armored_string(&s, KeyType::Private).expect("invalid private key");
        assert_eq!(private_key, private_key2);
    }
+
+    #[test]
+    fn test_split_key() {
+        let private_key = Key::from(KEYPAIR.secret.clone());
+        let public_wrapped = private_key.split_key().unwrap();
+        let public = SignedPublicKey::try_from(public_wrapped).unwrap();
+        assert_eq!(public.primary_key, KEYPAIR.public.primary_key);
+    }
+
+    #[test]
+    fn test_save_self_key_twice() {
+        // Saving the same key twice should result in only one row in
+        // the keypairs table.
+        let t = dummy_context();
+        let nrows = || {
+            t.ctx
+                .sql
+                .query_get_value::<_, u32>(&t.ctx, "SELECT COUNT(*) FROM keypairs;", params![])
+                .unwrap()
+        };
+        assert_eq!(nrows(), 0);
+        store_self_keypair(&t.ctx, &KEYPAIR, KeyPairUse::Default).unwrap();
+        assert_eq!(nrows(), 1);
+        store_self_keypair(&t.ctx, &KEYPAIR, KeyPairUse::Default).unwrap();
+        assert_eq!(nrows(), 1);
+    }
+
+    // Convenient way to create a new key if you need one, run with
+    // `cargo test key::tests::gen_key`.
+    // #[test]
+    // fn gen_key() {
+    //     let name = "fiona";
+    //     let keypair = crate::pgp::create_keypair(
+    //         EmailAddress::new(&format!("{}@example.net", name)).unwrap(),
+    //     )
+    //     .unwrap();
+    //     std::fs::write(
+    //         format!("test-data/key/{}-public.asc", name),
+    //         keypair.public.to_base64(),
+    //     )
+    //     .unwrap();
+    //     std::fs::write(
+    //         format!("test-data/key/{}-secret.asc", name),
+    //         keypair.secret.to_base64(),
+    //     )
+    //     .unwrap();
+    // }
 }
--- a/src/keyring.rs
+++ b/src/keyring.rs
@@ -1,8 +1,8 @@
 use std::borrow::Cow;

-use crate::constants::*;
+use crate::constants::KeyType;
 use crate::context::Context;
-use crate::key::*;
+use crate::key::Key;
 use crate::sql::Sql;

 #[derive(Default, Clone, Debug)]
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,9 +1,6 @@
-#![deny(clippy::correctness, missing_debug_implementations)]
-// TODO: make all of these errors, such that clippy actually passes.
-#![warn(clippy::all, clippy::perf, clippy::not_unsafe_ptr_arg_deref)]
-// This is nice, but for now just annoying.
-#![allow(clippy::unreadable_literal)]
-#![feature(ptr_wrapping_offset_from)]
+#![forbid(unsafe_code)]
+#![deny(clippy::correctness, missing_debug_implementations, clippy::all)]
+#![allow(clippy::match_bool)]

 #[macro_use]
 extern crate failure_derive;
@@ -20,10 +17,12 @@ extern crate strum_macros;
 extern crate debug_stub_derive;

 #[macro_use]
-mod log;
+pub mod log;
 #[macro_use]
 pub mod error;

+pub mod headerdef;
+
 pub(crate) mod events;
 pub use events::*;

@@ -40,6 +39,7 @@ mod e2ee;
 mod imap;
 mod imap_client;
 pub mod imex;
+#[macro_use]
 pub mod job;
 mod job_thread;
 pub mod key;
@@ -54,21 +54,25 @@ pub mod oauth2;
 mod param;
 pub mod peerstate;
 pub mod pgp;
+pub mod provider;
 pub mod qr;
 pub mod securejoin;
+mod simplify;
 mod smtp;
 pub mod sql;
 pub mod stock;
 mod token;
 #[macro_use]
-mod wrapmime;
 mod dehtml;

-pub mod dc_array;
 pub mod dc_receive_imf;
-mod dc_simplify;
-mod dc_strencode;
 pub mod dc_tools;

+/// if set imap/incoming and smtp/outgoing MIME messages will be printed
+pub const DCC_MIME_DEBUG: &str = "DCC_MIME_DEBUG";
+
+/// if set IMAP protocol commands and responses will be printed
+pub const DCC_IMAP_DEBUG: &str = "DCC_IMAP_DEBUG";
+
 #[cfg(test)]
 mod test_utils;
--- a/src/location.rs
+++ b/src/location.rs
@@ -4,14 +4,14 @@ use bitflags::bitflags;
 use quick_xml;
 use quick_xml::events::{BytesEnd, BytesStart, BytesText};

-use crate::chat;
+use crate::chat::{self, ChatId};
 use crate::config::Config;
 use crate::constants::*;
 use crate::context::*;
 use crate::dc_tools::*;
 use crate::error::Error;
 use crate::events::Event;
-use crate::job::*;
+use crate::job::{self, job_action_exists, job_add, Job};
 use crate::message::{Message, MsgId};
 use crate::mimeparser::SystemMessage;
 use crate::param::*;
@@ -28,7 +28,7 @@ pub struct Location {
    pub timestamp: i64,
    pub contact_id: u32,
    pub msg_id: u32,
-    pub chat_id: u32,
+    pub chat_id: ChatId,
    pub marker: Option<String>,
    pub independent: u32,
 }
@@ -193,9 +193,9 @@ impl Kml {
 }

 // location streaming
-pub fn send_locations_to_chat(context: &Context, chat_id: u32, seconds: i64) {
+pub fn send_locations_to_chat(context: &Context, chat_id: ChatId, seconds: i64) {
    let now = time();
-    if !(seconds < 0 || chat_id <= DC_CHAT_ID_LAST_SPECIAL) {
+    if !(seconds < 0 || chat_id.is_special()) {
        let is_sending_locations_before = is_sending_locations_to_chat(context, chat_id);
        if sql::execute(
            context,
@@ -207,7 +207,7 @@ pub fn send_locations_to_chat(context: &Context, chat_id: u32, seconds: i64) {
            params![
                if 0 != seconds { now } else { 0 },
                if 0 != seconds { now + seconds } else { 0 },
-                chat_id as i32,
+                chat_id,
            ],
        )
        .is_ok()
@@ -228,8 +228,8 @@ pub fn send_locations_to_chat(context: &Context, chat_id: u32, seconds: i64) {
                schedule_MAYBE_SEND_LOCATIONS(context, false);
                job_add(
                    context,
-                    Action::MaybeSendLocationsEnded,
-                    chat_id as i32,
+                    job::Action::MaybeSendLocationsEnded,
+                    chat_id.to_u32() as i32,
                    Params::new(),
                    seconds + 1,
                );
@@ -240,17 +240,23 @@ pub fn send_locations_to_chat(context: &Context, chat_id: u32, seconds: i64) {

 #[allow(non_snake_case)]
 fn schedule_MAYBE_SEND_LOCATIONS(context: &Context, force_schedule: bool) {
-    if force_schedule || !job_action_exists(context, Action::MaybeSendLocations) {
-        job_add(context, Action::MaybeSendLocations, 0, Params::new(), 60);
+    if force_schedule || !job_action_exists(context, job::Action::MaybeSendLocations) {
+        job_add(
+            context,
+            job::Action::MaybeSendLocations,
+            0,
+            Params::new(),
+            60,
+        );
    };
 }

-pub fn is_sending_locations_to_chat(context: &Context, chat_id: u32) -> bool {
+pub fn is_sending_locations_to_chat(context: &Context, chat_id: ChatId) -> bool {
    context
        .sql
        .exists(
            "SELECT id  FROM chats  WHERE (? OR id=?)   AND locations_send_until>?;",
-            params![if chat_id == 0 { 1 } else { 0 }, chat_id as i32, time()],
+            params![if chat_id.is_unset() { 1 } else { 0 }, chat_id, time()],
        )
        .unwrap_or_default()
 }
@@ -296,7 +302,7 @@ pub fn set(context: &Context, latitude: f64, longitude: f64, accuracy: f64) -> b

 pub fn get_range(
    context: &Context,
-    chat_id: u32,
+    chat_id: ChatId,
    contact_id: u32,
    timestamp_from: i64,
    mut timestamp_to: i64,
@@ -314,8 +320,8 @@ pub fn get_range(
             AND (l.independent=1 OR (l.timestamp>=? AND l.timestamp<=?)) \
             ORDER BY l.timestamp DESC, l.id DESC, msg_id DESC;",
            params![
-                if chat_id == 0 { 1 } else { 0 },
-                chat_id as i32,
+                if chat_id.is_unset() { 1 } else { 0 },
+                chat_id,
                if contact_id == 0 { 1 } else { 0 },
                contact_id as i32,
                timestamp_from,
@@ -365,7 +371,7 @@ pub fn delete_all(context: &Context) -> Result<(), Error> {
    Ok(())
 }

-pub fn get_kml(context: &Context, chat_id: u32) -> Result<(String, u32), Error> {
+pub fn get_kml(context: &Context, chat_id: ChatId) -> Result<(String, u32), Error> {
    let mut last_added_location_id = 0;

    let self_addr = context
@@ -374,7 +380,7 @@ pub fn get_kml(context: &Context, chat_id: u32) -> Result<(String, u32), Error>

    let (locations_send_begin, locations_send_until, locations_last_sent) = context.sql.query_row(
        "SELECT locations_send_begin, locations_send_until, locations_last_sent  FROM chats  WHERE id=?;",
-        params![chat_id as i32], |row| {
+        params![chat_id], |row| {
            let send_begin: i64 = row.get(0)?;
            let send_until: i64 = row.get(1)?;
            let last_sent: i64 = row.get(2)?;
@@ -459,14 +465,14 @@ pub fn get_message_kml(timestamp: i64, latitude: f64, longitude: f64) -> String

 pub fn set_kml_sent_timestamp(
    context: &Context,
-    chat_id: u32,
+    chat_id: ChatId,
    timestamp: i64,
 ) -> Result<(), Error> {
    sql::execute(
        context,
        &context.sql,
        "UPDATE chats SET locations_last_sent=? WHERE id=?;",
-        params![timestamp, chat_id as i32],
+        params![timestamp, chat_id],
    )?;

    Ok(())
@@ -489,12 +495,12 @@ pub fn set_msg_location_id(

 pub fn save(
    context: &Context,
-    chat_id: u32,
+    chat_id: ChatId,
    contact_id: u32,
    locations: &[Location],
    independent: bool,
 ) -> Result<u32, Error> {
-    ensure!(chat_id > DC_CHAT_ID_LAST_SPECIAL, "Invalid chat id");
+    ensure!(!chat_id.is_special(), "Invalid chat id");
    context
        .sql
        .prepare2(
@@ -514,7 +520,7 @@ pub fn save(
                        stmt_insert.execute(params![
                            location.timestamp,
                            contact_id as i32,
-                            chat_id as i32,
+                            chat_id,
                            location.latitude,
                            location.longitude,
                            location.accuracy,
@@ -542,7 +548,7 @@ pub fn save(
 }

 #[allow(non_snake_case)]
-pub fn JobMaybeSendLocations(context: &Context, _job: &Job) {
+pub fn JobMaybeSendLocations(context: &Context, _job: &Job) -> job::Status {
    let now = time();
    let mut continue_streaming = false;
    info!(
@@ -556,7 +562,7 @@ pub fn JobMaybeSendLocations(context: &Context, _job: &Job) {
         WHERE locations_send_until>?;",
        params![now],
        |row| {
-            let chat_id: i32 = row.get(0)?;
+            let chat_id: ChatId = row.get(0)?;
            let locations_send_begin: i64 = row.get(1)?;
            let locations_last_sent: i64 = row.get(2)?;
            continue_streaming = true;
@@ -623,44 +629,46 @@ pub fn JobMaybeSendLocations(context: &Context, _job: &Job) {

        for (chat_id, mut msg) in msgs.into_iter() {
            // TODO: better error handling
-            chat::send_msg(context, chat_id as u32, &mut msg).unwrap_or_default();
+            chat::send_msg(context, chat_id, &mut msg).unwrap_or_default();
        }
    }
    if continue_streaming {
        schedule_MAYBE_SEND_LOCATIONS(context, true);
    }
+    job::Status::Finished(Ok(()))
 }

 #[allow(non_snake_case)]
-pub fn JobMaybeSendLocationsEnded(context: &Context, job: &mut Job) {
+pub fn JobMaybeSendLocationsEnded(context: &Context, job: &mut Job) -> job::Status {
    // this function is called when location-streaming _might_ have ended for a chat.
    // the function checks, if location-streaming is really ended;
    // if so, a device-message is added if not yet done.

-    let chat_id = job.foreign_id;
+    let chat_id = ChatId::new(job.foreign_id);

-    if let Ok((send_begin, send_until)) = context.sql.query_row(
+    let (send_begin, send_until) = job_try!(context.sql.query_row(
        "SELECT locations_send_begin, locations_send_until  FROM chats  WHERE id=?",
-        params![chat_id as i32],
+        params![chat_id],
        |row| Ok((row.get::<_, i64>(0)?, row.get::<_, i64>(1)?)),
-    ) {
-        if !(send_begin != 0 && time() <= send_until) {
-            // still streaming -
-            // may happen as several calls to dc_send_locations_to_chat()
-            // do not un-schedule pending DC_MAYBE_SEND_LOC_ENDED jobs
-            if !(send_begin == 0 && send_until == 0) {
-                // not streaming, device-message already sent
-                if context.sql.execute(
-                    "UPDATE chats    SET locations_send_begin=0, locations_send_until=0  WHERE id=?",
-                    params![chat_id as i32],
-                ).is_ok() {
-                    let stock_str = context.stock_system_msg(StockMessage::MsgLocationDisabled, "", "", 0);
-                    chat::add_info_msg(context, chat_id, stock_str);
-                    context.call_cb(Event::ChatModified(chat_id));
-                }
-            }
+    ));
+
+    if !(send_begin != 0 && time() <= send_until) {
+        // still streaming -
+        // may happen as several calls to dc_send_locations_to_chat()
+        // do not un-schedule pending DC_MAYBE_SEND_LOC_ENDED jobs
+        if !(send_begin == 0 && send_until == 0) {
+            // not streaming, device-message already sent
+            job_try!(context.sql.execute(
+                "UPDATE chats    SET locations_send_begin=0, locations_send_until=0  WHERE id=?",
+                params![chat_id],
+            ));
+
+            let stock_str = context.stock_system_msg(StockMessage::MsgLocationDisabled, "", "", 0);
+            chat::add_info_msg(context, chat_id, stock_str);
+            context.call_cb(Event::ChatModified(chat_id));
        }
    }
+    job::Status::Finished(Ok(()))
 }

 #[cfg(test)]
--- a/src/log.rs
+++ b/src/log.rs
@@ -7,7 +7,13 @@ macro_rules! info {
    };
    ($ctx:expr, $msg:expr, $($args:expr),* $(,)?) => {{
        let formatted = format!($msg, $($args),*);
-        emit_event!($ctx, $crate::Event::Info(formatted));
+        let thread = ::std::thread::current();
+        let full = format!("{thid:?} {file}:{line}: {msg}",
+                           thid = thread.id(),
+                           file = file!(),
+                           line = line!(),
+                           msg = &formatted);
+        emit_event!($ctx, $crate::Event::Info(full));
    }};
 }

@@ -18,7 +24,13 @@ macro_rules! warn {
    };
    ($ctx:expr, $msg:expr, $($args:expr),* $(,)?) => {{
        let formatted = format!($msg, $($args),*);
-        emit_event!($ctx, $crate::Event::Warning(formatted));
+        let thread = ::std::thread::current();
+        let full = format!("{thid:?} {file}:{line}: {msg}",
+                           thid = thread.id(),
+                           file = file!(),
+                           line = line!(),
+                           msg = &formatted);
+        emit_event!($ctx, $crate::Event::Warning(full));
    }};
 }

--- a/src/login_param.rs
+++ b/src/login_param.rs
@@ -1,12 +1,9 @@
+//! # Login parameters
+
 use std::borrow::Cow;
 use std::fmt;

 use crate::context::Context;
-use crate::error::Error;
-use async_std::sync::Arc;
-use rustls;
-use webpki;
-use webpki_roots;

 #[derive(Copy, Clone, Debug, Display, FromPrimitive)]
 #[repr(i32)]
@@ -14,7 +11,11 @@ use webpki_roots;
 pub enum CertificateChecks {
    Automatic = 0,
    Strict = 1,
-    AcceptInvalidHostnames = 2,
+
+    /// Same as AcceptInvalidCertificates
+    /// Previously known as AcceptInvalidHostnames, now deprecated.
+    AcceptInvalidCertificates2 = 2,
+
    AcceptInvalidCertificates = 3,
 }

@@ -104,7 +105,7 @@ impl LoginParam {
        let server_flags = sql.get_raw_config_int(context, key).unwrap_or_default();

        LoginParam {
-            addr: addr.to_string(),
+            addr,
            mail_server,
            mail_user,
            mail_pw,
@@ -128,7 +129,7 @@ impl LoginParam {
        &self,
        context: &Context,
        prefix: impl AsRef<str>,
-    ) -> Result<(), Error> {
+    ) -> crate::sql::Result<()> {
        let prefix = prefix.as_ref();
        let sql = &context.sql;

@@ -198,6 +199,7 @@ impl fmt::Display for LoginParam {
    }
 }

+#[allow(clippy::ptr_arg)]
 fn unset_empty(s: &String) -> Cow<String> {
    if s.is_empty() {
        Cow::Owned("unset".to_string())
@@ -206,44 +208,45 @@ fn unset_empty(s: &String) -> Cow<String> {
    }
 }

+#[allow(clippy::useless_let_if_seq)]
 fn get_readable_flags(flags: i32) -> String {
    let mut res = String::new();
    for bit in 0..31 {
        if 0 != flags & 1 << bit {
-            let mut flag_added = 0;
+            let mut flag_added = false;
            if 1 << bit == 0x2 {
                res += "OAUTH2 ";
-                flag_added = 1;
+                flag_added = true;
            }
            if 1 << bit == 0x4 {
                res += "AUTH_NORMAL ";
-                flag_added = 1;
+                flag_added = true;
            }
            if 1 << bit == 0x100 {
                res += "IMAP_STARTTLS ";
-                flag_added = 1;
+                flag_added = true;
            }
            if 1 << bit == 0x200 {
                res += "IMAP_SSL ";
-                flag_added = 1;
+                flag_added = true;
            }
            if 1 << bit == 0x400 {
                res += "IMAP_PLAIN ";
-                flag_added = 1;
+                flag_added = true;
            }
            if 1 << bit == 0x10000 {
                res += "SMTP_STARTTLS ";
-                flag_added = 1
+                flag_added = true;
            }
            if 1 << bit == 0x20000 {
                res += "SMTP_SSL ";
-                flag_added = 1
+                flag_added = true;
            }
            if 1 << bit == 0x40000 {
                res += "SMTP_PLAIN ";
-                flag_added = 1
+                flag_added = true;
            }
-            if 0 == flag_added {
+            if flag_added {
                res += &format!("{:#0x}", 1 << bit);
            }
        }
@@ -255,49 +258,22 @@ fn get_readable_flags(flags: i32) -> String {
    res
 }

-pub struct NoCertificateVerification {}
-
-impl rustls::ServerCertVerifier for NoCertificateVerification {
-    fn verify_server_cert(
-        &self,
-        _roots: &rustls::RootCertStore,
-        _presented_certs: &[rustls::Certificate],
-        _dns_name: webpki::DNSNameRef<'_>,
-        _ocsp: &[u8],
-    ) -> Result<rustls::ServerCertVerified, rustls::TLSError> {
-        Ok(rustls::ServerCertVerified::assertion())
-    }
-}
-
-pub fn dc_build_tls_config(certificate_checks: CertificateChecks) -> rustls::ClientConfig {
-    let mut config = rustls::ClientConfig::new();
-    config
-        .root_store
-        .add_server_trust_anchors(&webpki_roots::TLS_SERVER_ROOTS);
-
+pub fn dc_build_tls(certificate_checks: CertificateChecks) -> async_native_tls::TlsConnector {
+    let tls_builder = async_native_tls::TlsConnector::new();
    match certificate_checks {
-        CertificateChecks::Strict => {}
        CertificateChecks::Automatic => {
            // Same as AcceptInvalidCertificates for now.
            // TODO: use provider database when it becomes available
-            config
-                .dangerous()
-                .set_certificate_verifier(Arc::new(NoCertificateVerification {}));
-        }
-        CertificateChecks::AcceptInvalidCertificates => {
-            // TODO: only accept invalid certs
-            config
-                .dangerous()
-                .set_certificate_verifier(Arc::new(NoCertificateVerification {}));
-        }
-        CertificateChecks::AcceptInvalidHostnames => {
-            // TODO: only accept invalid hostnames
-            config
-                .dangerous()
-                .set_certificate_verifier(Arc::new(NoCertificateVerification {}));
+            tls_builder
+                .danger_accept_invalid_hostnames(true)
+                .danger_accept_invalid_certs(true)
        }
+        CertificateChecks::Strict => tls_builder,
+        CertificateChecks::AcceptInvalidCertificates
+        | CertificateChecks::AcceptInvalidCertificates2 => tls_builder
+            .danger_accept_invalid_hostnames(true)
+            .danger_accept_invalid_certs(true),
    }
-    config
 }

 #[cfg(test)]
@@ -309,8 +285,8 @@ mod tests {
        use std::string::ToString;

        assert_eq!(
-            "accept_invalid_hostnames".to_string(),
-            CertificateChecks::AcceptInvalidHostnames.to_string()
+            "accept_invalid_certificates".to_string(),
+            CertificateChecks::AcceptInvalidCertificates.to_string()
        );
    }
 }
--- a/src/lot.rs
+++ b/src/lot.rs
@@ -5,7 +5,7 @@ use deltachat_derive::{FromSql, ToSql};
 /// Lot objects are created
 /// eg. by chatlist.get_summary() or dc_msg_get_summary().
 ///
-/// _Lot_ is used in the meaning _heap_ here.
+/// *Lot* is used in the meaning *heap* here.
 #[derive(Default, Debug, Clone)]
 pub struct Lot {
    pub(crate) text1_meaning: Meaning,
@@ -73,20 +73,31 @@ pub enum LotState {
    // Qr States
    /// id=contact
    QrAskVerifyContact = 200,
+
    /// text1=groupname
    QrAskVerifyGroup = 202,
+
    /// id=contact
    QrFprOk = 210,
+
    /// id=contact
    QrFprMissmatch = 220,
+
    /// test1=formatted fingerprint
    QrFprWithoutAddr = 230,
+
+    /// text1=domain
+    QrAccount = 250,
+
    /// id=contact
    QrAddr = 320,
+
    /// text1=text
    QrText = 330,
+
    /// text1=URL
    QrUrl = 332,
+
    /// text1=error string
    QrError = 400,

--- a/src/message.rs
+++ b/src/message.rs
@@ -1,9 +1,11 @@
+//! # Messages and their identifiers
+
 use std::path::{Path, PathBuf};

 use deltachat_derive::{FromSql, ToSql};
 use failure::Fail;

-use crate::chat::{self, Chat};
+use crate::chat::{self, Chat, ChatId};
 use crate::constants::*;
 use crate::contact::*;
 use crate::context::*;
@@ -44,11 +46,8 @@ impl MsgId {
    /// Whether the message ID signifies a special message.
    ///
    /// This kind of message ID can not be used for real messages.
-    pub fn is_special(&self) -> bool {
-        match self.0 {
-            0..=DC_MSG_ID_LAST_SPECIAL => true,
-            _ => false,
-        }
+    pub fn is_special(self) -> bool {
+        self.0 <= DC_MSG_ID_LAST_SPECIAL
    }

    /// Whether the message ID is unset.
@@ -60,21 +59,21 @@ impl MsgId {
    ///
    /// When this is `true`, [MsgId::is_special] will also always be
    /// `true`.
-    pub fn is_unset(&self) -> bool {
+    pub fn is_unset(self) -> bool {
        self.0 == 0
    }

    /// Whether the message ID is the special marker1 marker.
    ///
    /// See the docs of the `dc_get_chat_msgs` C API for details.
-    pub fn is_marker1(&self) -> bool {
+    pub fn is_marker1(self) -> bool {
        self.0 == DC_MSG_ID_MARKER1
    }

    /// Whether the message ID is the special day marker.
    ///
    /// See the docs of the `dc_get_chat_msgs` C API for details.
-    pub fn is_daymarker(&self) -> bool {
+    pub fn is_daymarker(self) -> bool {
        self.0 == DC_MSG_ID_DAYMARKER
    }

@@ -82,7 +81,7 @@ impl MsgId {
    ///
    /// Avoid using this, eventually types should be cleaned up enough
    /// that it is no longer necessary.
-    pub fn to_u32(&self) -> u32 {
+    pub fn to_u32(self) -> u32 {
        self.0
    }
 }
@@ -146,6 +145,22 @@ impl rusqlite::types::FromSql for MsgId {
 #[fail(display = "Invalid Message ID.")]
 pub struct InvalidMsgId;

+#[derive(Debug, Copy, Clone, PartialEq, FromPrimitive, ToPrimitive, FromSql, ToSql)]
+#[repr(u8)]
+pub enum MessengerMessage {
+    No = 0,
+    Yes = 1,
+
+    /// No, but reply to messenger message.
+    Reply = 2,
+}
+
+impl Default for MessengerMessage {
+    fn default() -> Self {
+        Self::No
+    }
+}
+
 /// An object representing a single message in memory.
 /// The message object is not updated.
 /// If you want an update, you have to recreate the object.
@@ -158,8 +173,8 @@ pub struct Message {
    pub(crate) id: MsgId,
    pub(crate) from_id: u32,
    pub(crate) to_id: u32,
-    pub(crate) chat_id: u32,
-    pub(crate) type_0: Viewtype,
+    pub(crate) chat_id: ChatId,
+    pub(crate) viewtype: Viewtype,
    pub(crate) state: MessageState,
    pub(crate) hidden: bool,
    pub(crate) timestamp_sort: i64,
@@ -170,8 +185,7 @@ pub struct Message {
    pub(crate) in_reply_to: Option<String>,
    pub(crate) server_folder: Option<String>,
    pub(crate) server_uid: u32,
-    // TODO: enum
-    pub(crate) is_dc_message: u32,
+    pub(crate) is_dc_message: MessengerMessage,
    pub(crate) starred: bool,
    pub(crate) chat_blocked: Blocked,
    pub(crate) location_id: u32,
@@ -181,7 +195,7 @@ pub struct Message {
 impl Message {
    pub fn new(viewtype: Viewtype) -> Self {
        let mut msg = Message::default();
-        msg.type_0 = viewtype;
+        msg.viewtype = viewtype;

        msg
    }
@@ -234,7 +248,7 @@ impl Message {
                    msg.timestamp_sort = row.get("timestamp")?;
                    msg.timestamp_sent = row.get("timestamp_sent")?;
                    msg.timestamp_rcvd = row.get("timestamp_rcvd")?;
-                    msg.type_0 = row.get("type")?;
+                    msg.viewtype = row.get("type")?;
                    msg.state = row.get("state")?;
                    msg.is_dc_message = row.get("msgrmsg")?;

@@ -310,10 +324,10 @@ impl Message {
    }

    pub fn try_calc_and_set_dimensions(&mut self, context: &Context) -> Result<(), Error> {
-        if chat::msgtype_has_file(self.type_0) {
+        if chat::msgtype_has_file(self.viewtype) {
            let file_param = self.param.get_path(Param::File, context)?;
            if let Some(path_and_filename) = file_param {
-                if (self.type_0 == Viewtype::Image || self.type_0 == Viewtype::Gif)
+                if (self.viewtype == Viewtype::Image || self.viewtype == Viewtype::Gif)
                    && !self.param.exists(Param::Width)
                {
                    self.param.set_int(Param::Width, 0);
@@ -383,16 +397,16 @@ impl Message {
        self.from_id
    }

-    pub fn get_chat_id(&self) -> u32 {
+    pub fn get_chat_id(&self) -> ChatId {
        if self.chat_blocked != Blocked::Not {
-            1
+            ChatId::new(DC_CHAT_ID_DEADDROP)
        } else {
            self.chat_id
        }
    }

    pub fn get_viewtype(&self) -> Viewtype {
-        self.type_0
+        self.viewtype
    }

    pub fn get_state(&self) -> MessageState {
@@ -472,7 +486,7 @@ impl Message {

    pub fn get_summarytext(&self, context: &Context, approx_characters: usize) -> String {
        get_summarytext_by_raw(
-            self.type_0,
+            self.viewtype,
            self.text.as_ref(),
            &self.param,
            approx_characters,
@@ -516,11 +530,11 @@ impl Message {
    /// copied to the blobdir.  Thus those attachments need to be
    /// created immediately in the blobdir with a valid filename.
    pub fn is_increation(&self) -> bool {
-        chat::msgtype_has_file(self.type_0) && self.state == MessageState::OutPreparing
+        chat::msgtype_has_file(self.viewtype) && self.state == MessageState::OutPreparing
    }

    pub fn is_setupmessage(&self) -> bool {
-        if self.type_0 != Viewtype::File {
+        if self.viewtype != Viewtype::File {
            return false;
        }

@@ -593,18 +607,48 @@ impl Message {
    }
 }

-#[derive(Debug, Display, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, ToSql, FromSql)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, FromPrimitive, ToPrimitive, ToSql, FromSql)]
 #[repr(i32)]
 pub enum MessageState {
    Undefined = 0,
+
+    /// Incoming *fresh* message. Fresh messages are neither noticed
+    /// nor seen and are typically shown in notifications.
    InFresh = 10,
+
+    /// Incoming *noticed* message. E.g. chat opened but message not
+    /// yet read - noticed messages are not counted as unread but did
+    /// not marked as read nor resulted in MDNs.
    InNoticed = 13,
+
+    /// Incoming message, really *seen* by the user. Marked as read on
+    /// IMAP and MDN may be sent.
    InSeen = 16,
+
+    /// For files which need time to be prepared before they can be
+    /// sent, the message enters this state before
+    /// OutPending.
    OutPreparing = 18,
+
+    /// Message saved as draft.
    OutDraft = 19,
+
+    /// The user has pressed the "send" button but the message is not
+    /// yet sent and is pending in some way. Maybe we're offline (no
+    /// checkmark).
    OutPending = 20,
+
+    /// *Unrecoverable* error (*recoverable* errors result in pending
+    /// messages).
    OutFailed = 24,
+
+    /// Outgoing message successfully delivered to server (one
+    /// checkmark). Note, that already delivered messages may get into
+    /// the OutFailed state if we get such a hint from the server.
    OutDelivered = 26,
+
+    /// Outgoing message read by the recipient (two checkmarks; this
+    /// requires goodwill on the receiver's side)
    OutMdnRcvd = 28,
 }

@@ -614,6 +658,27 @@ impl Default for MessageState {
    }
 }

+impl std::fmt::Display for MessageState {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Self::Undefined => "Undefined",
+                Self::InFresh => "Fresh",
+                Self::InNoticed => "Noticed",
+                Self::InSeen => "Seen",
+                Self::OutPreparing => "Preparing",
+                Self::OutDraft => "Draft",
+                Self::OutPending => "Pending",
+                Self::OutFailed => "Failed",
+                Self::OutDelivered => "Delivered",
+                Self::OutMdnRcvd => "Read",
+            }
+        )
+    }
+}
+
 impl From<MessageState> for LotState {
    fn from(s: MessageState) -> Self {
        use MessageState::*;
@@ -669,7 +734,7 @@ impl Lot {
                self.text1 = None;
                self.text1_meaning = Meaning::None;
            } else {
-                if chat.id == DC_CHAT_ID_DEADDROP {
+                if chat.id.is_deaddrop() {
                    if let Some(contact) = contact {
                        self.text1 = Some(contact.get_display_name().into());
                    } else {
@@ -685,9 +750,9 @@ impl Lot {
        }

        self.text2 = Some(get_summarytext_by_raw(
-            msg.type_0,
+            msg.viewtype,
            msg.text.as_ref(),
-            &mut msg.param,
+            &msg.param,
            SUMMARY_CHARACTERS,
            context,
        ));
@@ -718,7 +783,7 @@ pub fn get_msg_info(context: &Context, msg_id: MsgId) -> String {
        return ret;
    }
    let rawtxt = rawtxt.unwrap_or_default();
-    let rawtxt = dc_truncate(rawtxt.trim(), 100000, false);
+    let rawtxt = dc_truncate(rawtxt.trim(), 100_000, false);

    let fts = dc_timestamp_to_str(msg.get_timestamp());
    ret += &format!("Sent: {}", fts);
@@ -768,19 +833,7 @@ pub fn get_msg_info(context: &Context, msg_id: MsgId) -> String {
        }
    }

-    ret += "State: ";
-    use MessageState::*;
-    match msg.state {
-        InFresh => ret += "Fresh",
-        InNoticed => ret += "Noticed",
-        InSeen => ret += "Seen",
-        OutDelivered => ret += "Delivered",
-        OutFailed => ret += "Failed",
-        OutMdnRcvd => ret += "Read",
-        OutPending => ret += "Pending",
-        OutPreparing => ret += "Preparing",
-        _ => ret += &format!("{}", msg.state),
-    }
+    ret += &format!("State: {}", msg.state);

    if msg.has_location() {
        ret += ", Location sent";
@@ -806,9 +859,9 @@ pub fn get_msg_info(context: &Context, msg_id: MsgId) -> String {
        ret += &format!("\nFile: {}, {}, bytes\n", path.display(), bytes);
    }

-    if msg.type_0 != Viewtype::Text {
+    if msg.viewtype != Viewtype::Text {
        ret += "Type: ";
-        ret += &format!("{}", msg.type_0);
+        ret += &format!("{}", msg.viewtype);
        ret += "\n";
        ret += &format!("Mimetype: {}\n", &msg.get_filemime().unwrap_or_default());
    }
@@ -842,6 +895,7 @@ pub fn guess_msgtype_from_suffix(path: &Path) -> Option<(Viewtype, &str)> {
        "mp3" => (Viewtype::Audio, "audio/mpeg"),
        "aac" => (Viewtype::Audio, "audio/aac"),
        "mp4" => (Viewtype::Video, "video/mp4"),
+        "webm" => (Viewtype::Video, "video/webm"),
        "jpg" => (Viewtype::Image, "image/jpeg"),
        "jpeg" => (Viewtype::Image, "image/jpeg"),
        "jpe" => (Viewtype::Image, "image/jpeg"),
@@ -872,7 +926,7 @@ pub fn delete_msgs(context: &Context, msg_ids: &[MsgId]) {
                delete_poi_location(context, msg.location_id);
            }
        }
-        update_msg_chat_id(context, *msg_id, DC_CHAT_ID_TRASH);
+        update_msg_chat_id(context, *msg_id, ChatId::new(DC_CHAT_ID_TRASH));
        job_add(
            context,
            Action::DeleteMsgOnImap,
@@ -884,7 +938,7 @@ pub fn delete_msgs(context: &Context, msg_ids: &[MsgId]) {

    if !msg_ids.is_empty() {
        context.call_cb(Event::MsgsChanged {
-            chat_id: 0,
+            chat_id: ChatId::new(0),
            msg_id: MsgId::new(0),
        });
        job_kill_action(context, Action::Housekeeping);
@@ -892,12 +946,12 @@ pub fn delete_msgs(context: &Context, msg_ids: &[MsgId]) {
    };
 }

-fn update_msg_chat_id(context: &Context, msg_id: MsgId, chat_id: u32) -> bool {
+fn update_msg_chat_id(context: &Context, msg_id: MsgId, chat_id: ChatId) -> bool {
    sql::execute(
        context,
        &context.sql,
        "UPDATE msgs SET chat_id=? WHERE id=?;",
-        params![chat_id as i32, msg_id],
+        params![chat_id, msg_id],
    )
    .is_ok()
 }
@@ -976,7 +1030,7 @@ pub fn markseen_msgs(context: &Context, msg_ids: &[MsgId]) -> bool {

    if send_event {
        context.call_cb(Event::MsgsChanged {
-            chat_id: 0,
+            chat_id: ChatId::new(0),
            msg_id: MsgId::new(0),
        });
    }
@@ -1087,14 +1141,14 @@ pub fn exists(context: &Context, msg_id: MsgId) -> bool {
        return false;
    }

-    let chat_id: Option<u32> = context.sql.query_get_value(
+    let chat_id: Option<ChatId> = context.sql.query_get_value(
        context,
        "SELECT chat_id FROM msgs WHERE id=?;",
        params![msg_id],
    );

    if let Some(chat_id) = chat_id {
-        chat_id != DC_CHAT_ID_TRASH
+        !chat_id.is_trash()
    } else {
        false
    }
@@ -1132,7 +1186,7 @@ pub fn mdn_from_ext(
    from_id: u32,
    rfc724_mid: &str,
    timestamp_sent: i64,
-) -> Option<(u32, MsgId)> {
+) -> Option<(ChatId, MsgId)> {
    if from_id <= DC_MSG_ID_LAST_SPECIAL || rfc724_mid.is_empty() {
        return None;
    }
@@ -1152,7 +1206,7 @@ pub fn mdn_from_ext(
        |row| {
            Ok((
                row.get::<_, MsgId>("msg_id")?,
-                row.get::<_, u32>("chat_id")?,
+                row.get::<_, ChatId>("chat_id")?,
                row.get::<_, Chattype>("type")?,
                row.get::<_, MessageState>("state")?,
            ))
@@ -1218,9 +1272,10 @@ pub fn mdn_from_ext(
                } // else wait for more receipts
            }
        }
-        return match read_by_all {
-            true => Some((chat_id, msg_id)),
-            false => None,
+        return if read_by_all {
+            Some((chat_id, msg_id))
+        } else {
+            None
        };
    }
    None
@@ -1368,50 +1423,32 @@ mod tests {
        some_file.set(Param::File, "foo.bar");

        assert_eq!(
-            get_summarytext_by_raw(
-                Viewtype::Text,
-                some_text.as_ref(),
-                &mut Params::new(),
-                50,
-                &ctx
-            ),
+            get_summarytext_by_raw(Viewtype::Text, some_text.as_ref(), &Params::new(), 50, &ctx),
            "bla bla" // for simple text, the type is not added to the summary
        );

        assert_eq!(
-            get_summarytext_by_raw(Viewtype::Image, no_text.as_ref(), &mut some_file, 50, &ctx,),
+            get_summarytext_by_raw(Viewtype::Image, no_text.as_ref(), &some_file, 50, &ctx,),
            "Image" // file names are not added for images
        );

        assert_eq!(
-            get_summarytext_by_raw(Viewtype::Video, no_text.as_ref(), &mut some_file, 50, &ctx,),
+            get_summarytext_by_raw(Viewtype::Video, no_text.as_ref(), &some_file, 50, &ctx,),
            "Video" // file names are not added for videos
        );

        assert_eq!(
-            get_summarytext_by_raw(Viewtype::Gif, no_text.as_ref(), &mut some_file, 50, &ctx,),
+            get_summarytext_by_raw(Viewtype::Gif, no_text.as_ref(), &some_file, 50, &ctx,),
            "GIF" // file names are not added for GIFs
        );

        assert_eq!(
-            get_summarytext_by_raw(
-                Viewtype::Sticker,
-                no_text.as_ref(),
-                &mut some_file,
-                50,
-                &ctx,
-            ),
+            get_summarytext_by_raw(Viewtype::Sticker, no_text.as_ref(), &some_file, 50, &ctx,),
            "Sticker" // file names are not added for stickers
        );

        assert_eq!(
-            get_summarytext_by_raw(
-                Viewtype::Voice,
-                empty_text.as_ref(),
-                &mut some_file,
-                50,
-                &ctx,
-            ),
+            get_summarytext_by_raw(Viewtype::Voice, empty_text.as_ref(), &some_file, 50, &ctx,),
            "Voice message" // file names are not added for voice messages, empty text is skipped
        );

@@ -1421,13 +1458,7 @@ mod tests {
        );

        assert_eq!(
-            get_summarytext_by_raw(
-                Viewtype::Voice,
-                some_text.as_ref(),
-                &mut some_file,
-                50,
-                &ctx
-            ),
+            get_summarytext_by_raw(Viewtype::Voice, some_text.as_ref(), &some_file, 50, &ctx),
            "Voice message \u{2013} bla bla" // `\u{2013}` explicitly checks for "EN DASH"
        );

@@ -1437,24 +1468,12 @@ mod tests {
        );

        assert_eq!(
-            get_summarytext_by_raw(
-                Viewtype::Audio,
-                empty_text.as_ref(),
-                &mut some_file,
-                50,
-                &ctx,
-            ),
+            get_summarytext_by_raw(Viewtype::Audio, empty_text.as_ref(), &some_file, 50, &ctx,),
            "Audio \u{2013} foo.bar" // file name is added for audio, empty text is not added
        );

        assert_eq!(
-            get_summarytext_by_raw(
-                Viewtype::Audio,
-                some_text.as_ref(),
-                &mut some_file,
-                50,
-                &ctx
-            ),
+            get_summarytext_by_raw(Viewtype::Audio, some_text.as_ref(), &some_file, 50, &ctx),
            "Audio \u{2013} foo.bar \u{2013} bla bla" // file name and text added for audio
        );

--- a/src/mimefactory.rs
+++ b/src/mimefactory.rs
--- a/src/mimeparser.rs
+++ b/src/mimeparser.rs
--- a/src/oauth2.rs
+++ b/src/oauth2.rs
@@ -154,7 +154,7 @@ pub fn dc_get_oauth2_access_token(
        }

        // ... and POST
-        let response = reqwest::Client::new()
+        let response = reqwest::blocking::Client::new()
            .post(post_url)
            .form(&post_param)
            .send();
@@ -165,7 +165,7 @@ pub fn dc_get_oauth2_access_token(
            );
            return None;
        }
-        let mut response = response.unwrap();
+        let response = response.unwrap();
        if !response.status().is_success() {
            warn!(
                context,
@@ -271,7 +271,8 @@ impl Oauth2 {
        {
            match domain {
                "gmail.com" | "googlemail.com" => Some(OAUTH2_GMAIL),
-                "yandex.com" | "yandex.ru" | "yandex.ua" => Some(OAUTH2_YANDEX),
+                "yandex.com" | "yandex.by" | "yandex.kz" | "yandex.ru" | "yandex.ua" | "ya.ru"
+                | "narod.ru" => Some(OAUTH2_YANDEX),
                _ => None,
            }
        } else {
@@ -290,12 +291,12 @@ impl Oauth2 {
        //   "verified_email": true,
        //   "picture": "https://lh4.googleusercontent.com/-Gj5jh_9R0BY/AAAAAAAAAAI/AAAAAAAAAAA/IAjtjfjtjNA/photo.jpg"
        // }
-        let response = reqwest::Client::new().get(&userinfo_url).send();
+        let response = reqwest::blocking::Client::new().get(&userinfo_url).send();
        if response.is_err() {
            warn!(context, "Error getting userinfo: {:?}", response);
            return None;
        }
-        let mut response = response.unwrap();
+        let response = response.unwrap();
        if !response.status().is_success() {
            warn!(context, "Error getting userinfo: {:?}", response.status());
            return None;
@@ -310,14 +311,19 @@ impl Oauth2 {
            return None;
        }
        if let Ok(response) = parsed {
-            // serde_json::Value.as_str() removes the quotes of json-strings
-            let addr = response.get("email");
-            if addr.is_none() {
+            // CAVE: serde_json::Value.as_str() removes the quotes of json-strings
+            // but serde_json::Value.to_string() does not!
+            if let Some(addr) = response.get("email") {
+                if let Some(s) = addr.as_str() {
+                    Some(s.to_string())
+                } else {
+                    warn!(context, "E-mail in userinfo is not a string: {}", addr);
+                    None
+                }
+            } else {
                warn!(context, "E-mail missing in userinfo.");
-                return None;
+                None
            }
-            let addr = addr.unwrap().as_str();
-            addr.map(|addr| addr.to_string())
        } else {
            warn!(context, "Failed to parse userinfo.");
            None
--- a/src/param.rs
+++ b/src/param.rs
@@ -8,6 +8,7 @@ use num_traits::FromPrimitive;
 use crate::blob::{BlobError, BlobObject};
 use crate::context::Context;
 use crate::error;
+use crate::message::MsgId;
 use crate::mimeparser::SystemMessage;

 /// Available param keys.
@@ -16,74 +17,109 @@ use crate::mimeparser::SystemMessage;
 pub enum Param {
    /// For messages and jobs
    File = b'f',
+
    /// For Messages
    Width = b'w',
+
    /// For Messages
    Height = b'h',
+
    /// For Messages
    Duration = b'd',
+
    /// For Messages
    MimeType = b'm',
-    /// For Messages: message is encryoted, outgoing: guarantee E2EE or the message is not send
+
+    /// For Messages: message is encrypted, outgoing: guarantee E2EE or the message is not send
    GuaranteeE2ee = b'c',
+
    /// For Messages: decrypted with validation errors or without mutual set, if neither
    /// 'c' nor 'e' are preset, the messages is only transport encrypted.
    ErroneousE2ee = b'e',
+
    /// For Messages: force unencrypted message, either `ForcePlaintext::AddAutocryptHeader` (1),
    /// `ForcePlaintext::NoAutocryptHeader` (2) or 0.
    ForcePlaintext = b'u',
+
    /// For Messages
    WantsMdn = b'r',
+
    /// For Messages
    Forwarded = b'a',
+
    /// For Messages
    Cmd = b'S',
+
    /// For Messages
    Arg = b'E',
+
    /// For Messages
    Arg2 = b'F',
+
    /// For Messages
    Arg3 = b'G',
+
    /// For Messages
    Arg4 = b'H',
+
    /// For Messages
    Error = b'L',
+
+    /// For Messages
+    AttachGroupImage = b'A',
+
    /// For Messages: space-separated list of messaged IDs of forwarded copies.
    ///
-    /// This is used when a [Message] is in the
-    /// [MessageState::OutPending] state but is already forwarded.
+    /// This is used when a [crate::message::Message] is in the
+    /// [crate::message::MessageState::OutPending] state but is already forwarded.
    /// In this case the forwarded messages are written to the
    /// database and their message IDs are added to this parameter of
    /// the original message, which is also saved in the database.
    /// When the original message is then finally sent this parameter
    /// is used to also send all the forwarded messages.
    PrepForwards = b'P',
+
    /// For Jobs
    SetLatitude = b'l',
+
    /// For Jobs
    SetLongitude = b'n',
+
    /// For Jobs
    ServerFolder = b'Z',
+
    /// For Jobs
    ServerUid = b'z',
+
    /// For Jobs
    AlsoMove = b'M',
+
    /// For Jobs: space-separated list of message recipients
    Recipients = b'R',
-    // For Groups
+
+    /// For Groups
    Unpromoted = b'U',
-    // For Groups and Contacts
+
+    /// For Groups and Contacts
    ProfileImage = b'i',
-    // For Chats
+
+    /// For Chats
    Selftalk = b'K',
-    // For Chats
+
+    /// For Chats
    Devicetalk = b'D',
-    // For QR
+
+    /// For QR
    Auth = b's',
-    // For QR
+
+    /// For QR
    GroupId = b'x',
-    // For QR
+
+    /// For QR
    GroupName = b'g',
+
+    /// For MDN-sending job
+    MsgId = b'I',
 }

 /// Possible values for `Param::ForcePlaintext`.
@@ -192,6 +228,11 @@ impl Params {
        self.get(key).and_then(|s| s.parse().ok())
    }

+    /// Get the given parameter and parse as `bool`.
+    pub fn get_bool(&self, key: Param) -> Option<bool> {
+        self.get_int(key).map(|v| v != 0)
+    }
+
    /// Get the parameter behind `Param::Cmd` interpreted as `SystemMessage`.
    pub fn get_cmd(&self) -> SystemMessage {
        self.get_int(Param::Cmd)
@@ -222,7 +263,7 @@ impl Params {
            Some(val) => val,
            None => return Ok(None),
        };
-        ParamsFile::from_param(context, val).map(|file| Some(file))
+        ParamsFile::from_param(context, val).map(Some)
    }

    /// Gets the parameter and returns a [BlobObject] for it.
@@ -250,7 +291,7 @@ impl Params {
        let file = ParamsFile::from_param(context, val)?;
        let blob = match file {
            ParamsFile::FsPath(path) => match create {
-                true => BlobObject::create_from_path(context, path)?,
+                true => BlobObject::new_from_path(context, path)?,
                false => BlobObject::from_path(context, path)?,
            },
            ParamsFile::Blob(blob) => blob,
@@ -275,6 +316,12 @@ impl Params {
        Ok(Some(path))
    }

+    pub fn get_msg_id(&self) -> Option<MsgId> {
+        self.get(Param::MsgId)
+            .and_then(|x| x.parse::<u32>().ok())
+            .map(MsgId::new)
+    }
+
    /// Set the given paramter to the passed in `i32`.
    pub fn set_int(&mut self, key: Param, value: i32) -> &mut Self {
        self.set(key, format!("{}", value));
@@ -373,7 +420,7 @@ mod tests {
        if let ParamsFile::FsPath(p) = ParamsFile::from_param(&t.ctx, "/foo/bar/baz").unwrap() {
            assert_eq!(p, Path::new("/foo/bar/baz"));
        } else {
-            assert!(false, "Wrong enum variant");
+            panic!("Wrong enum variant");
        }
    }

@@ -383,7 +430,7 @@ mod tests {
        if let ParamsFile::Blob(b) = ParamsFile::from_param(&t.ctx, "$BLOBDIR/foo").unwrap() {
            assert_eq!(b.as_name(), "$BLOBDIR/foo");
        } else {
-            assert!(false, "Wrong enum variant");
+            panic!("Wrong enum variant");
        }
    }

--- a/src/peerstate.rs
+++ b/src/peerstate.rs
@@ -1,14 +1,14 @@
 //! # [Autocrypt Peer State](https://autocrypt.org/level1.html#peer-state-management) module
 use std::collections::HashSet;
+use std::convert::TryFrom;
 use std::fmt;

 use num_traits::FromPrimitive;

 use crate::aheader::*;
-use crate::chat::*;
 use crate::constants::*;
 use crate::context::Context;
-use crate::key::*;
+use crate::key::{Key, SignedPublicKey};
 use crate::sql::{self, Sql};

 #[derive(Debug)]
@@ -95,6 +95,7 @@ pub enum ToSave {
 pub enum DegradeEvent {
    /// Recoverable by an incoming encrypted mail.
    EncryptionPaused = 0x01,
+
    /// Recoverable by a new verify.
    FingerprintChanged = 0x02,
 }
@@ -126,7 +127,7 @@ impl<'a> Peerstate<'a> {
        res.last_seen_autocrypt = message_time;
        res.to_save = Some(ToSave::All);
        res.prefer_encrypt = header.prefer_encrypt;
-        res.public_key = Some(header.public_key.clone());
+        res.public_key = Some(Key::from(header.public_key.clone()));
        res.recalc_fingerprint();

        res
@@ -137,7 +138,7 @@ impl<'a> Peerstate<'a> {

        res.gossip_timestamp = message_time;
        res.to_save = Some(ToSave::All);
-        res.gossip_key = Some(gossip_header.public_key.clone());
+        res.gossip_key = Some(Key::from(gossip_header.public_key.clone()));
        res.recalc_fingerprint();

        res
@@ -293,8 +294,8 @@ impl<'a> Peerstate<'a> {
                self.to_save = Some(ToSave::All)
            }

-            if self.public_key.as_ref() != Some(&header.public_key) {
-                self.public_key = Some(header.public_key.clone());
+            if self.public_key.as_ref() != Some(&Key::from(header.public_key.clone())) {
+                self.public_key = Some(Key::from(header.public_key.clone()));
                self.recalc_fingerprint();
                self.to_save = Some(ToSave::All);
            }
@@ -309,8 +310,9 @@ impl<'a> Peerstate<'a> {
        if message_time > self.gossip_timestamp {
            self.gossip_timestamp = message_time;
            self.to_save = Some(ToSave::Timestamps);
-            if self.gossip_key.as_ref() != Some(&gossip_header.public_key) {
-                self.gossip_key = Some(gossip_header.public_key.clone());
+            let hdr_key = Key::from(gossip_header.public_key.clone());
+            if self.gossip_key.as_ref() != Some(&hdr_key) {
+                self.gossip_key = Some(hdr_key);
                self.recalc_fingerprint();
                self.to_save = Some(ToSave::All)
            }
@@ -320,9 +322,10 @@ impl<'a> Peerstate<'a> {
    pub fn render_gossip_header(&self, min_verified: PeerstateVerifiedStatus) -> Option<String> {
        if let Some(key) = self.peek_key(min_verified) {
            // TODO: avoid cloning
+            let public_key = SignedPublicKey::try_from(key.clone()).ok()?;
            let header = Aheader::new(
                self.addr.clone(),
-                key.clone(),
+                public_key,
                EncryptPreference::NoPreference,
            );
            Some(header.to_string())
@@ -332,18 +335,13 @@ impl<'a> Peerstate<'a> {
    }

    pub fn peek_key(&self, min_verified: PeerstateVerifiedStatus) -> Option<&Key> {
-        if self.public_key.is_none() && self.gossip_key.is_none() && self.verified_key.is_none() {
-            return None;
+        match min_verified {
+            PeerstateVerifiedStatus::BidirectVerified => self.verified_key.as_ref(),
+            PeerstateVerifiedStatus::Unverified => self
+                .public_key
+                .as_ref()
+                .or_else(|| self.gossip_key.as_ref()),
        }
-
-        if min_verified != PeerstateVerifiedStatus::Unverified {
-            return self.verified_key.as_ref();
-        }
-        if self.public_key.is_some() {
-            return self.public_key.as_ref();
-        }
-
-        self.gossip_key.as_ref()
    }

    pub fn set_verified(
@@ -417,7 +415,6 @@ impl<'a> Peerstate<'a> {
                    &self.addr,
                ],
            )?;
-            reset_gossiped_timestamp(self.context, 0);
        } else if self.to_save == Some(ToSave::Timestamps) {
            sql::execute(
                self.context,
@@ -451,8 +448,8 @@ impl<'a> Peerstate<'a> {
 #[cfg(test)]
 mod tests {
    use super::*;
+    use crate::test_utils::*;
    use pretty_assertions::assert_eq;
-
    use tempfile::TempDir;

    #[test]
@@ -460,11 +457,7 @@ mod tests {
        let ctx = crate::test_utils::dummy_context();
        let addr = "hello@mail.com";

-        let pub_key = crate::key::Key::from_base64(
-            include_str!("../test-data/key/public.asc"),
-            KeyType::Public,
-        )
-        .unwrap();
+        let pub_key = crate::key::Key::from(alice_keypair().public);

        let mut peerstate = Peerstate {
            context: &ctx.ctx,
@@ -504,12 +497,7 @@ mod tests {
    fn test_peerstate_double_create() {
        let ctx = crate::test_utils::dummy_context();
        let addr = "hello@mail.com";
-
-        let pub_key = crate::key::Key::from_base64(
-            include_str!("../test-data/key/public.asc"),
-            KeyType::Public,
-        )
-        .unwrap();
+        let pub_key = crate::key::Key::from(alice_keypair().public);

        let peerstate = Peerstate {
            context: &ctx.ctx,
@@ -543,11 +531,7 @@ mod tests {
        let ctx = crate::test_utils::dummy_context();
        let addr = "hello@mail.com";

-        let pub_key = crate::key::Key::from_base64(
-            include_str!("../test-data/key/public.asc"),
-            KeyType::Public,
-        )
-        .unwrap();
+        let pub_key = crate::key::Key::from(alice_keypair().public);

        let mut peerstate = Peerstate {
            context: &ctx.ctx,
--- a/src/pgp.rs
+++ b/src/pgp.rs
@@ -16,7 +16,8 @@ use pgp::types::{
 };
 use rand::{thread_rng, CryptoRng, Rng};

-use crate::error::Error;
+use crate::dc_tools::EmailAddress;
+use crate::error::Result;
 use crate::key::*;
 use crate::keyring::*;

@@ -88,9 +89,7 @@ impl<'a> PublicKeyTrait for SignedPublicKeyOrSubkey<'a> {
 /// Split data from PGP Armored Data as defined in https://tools.ietf.org/html/rfc4880#section-6.2.
 ///
 /// Returns (type, headers, base64 encoded body).
-pub fn split_armored_data(
-    buf: &[u8],
-) -> Result<(BlockType, BTreeMap<String, String>, Vec<u8>), Error> {
+pub fn split_armored_data(buf: &[u8]) -> Result<(BlockType, BTreeMap<String, String>, Vec<u8>)> {
    use std::io::Read;

    let cursor = Cursor::new(buf);
@@ -113,10 +112,43 @@ pub fn split_armored_data(
    Ok((typ, headers, bytes))
 }

-/// Create a new key pair.
-pub fn create_keypair(addr: impl AsRef<str>) -> Option<(Key, Key)> {
-    let user_id = format!("<{}>", addr.as_ref());
+/// Error with generating a PGP keypair.
+///
+/// Most of these are likely coding errors rather than user errors
+/// since all variability is hardcoded.
+#[derive(Fail, Debug)]
+#[fail(display = "PgpKeygenError: {}", message)]
+pub(crate) struct PgpKeygenError {
+    message: String,
+    #[cause]
+    cause: failure::Error,
+    backtrace: failure::Backtrace,
+}

+impl PgpKeygenError {
+    fn new(message: impl Into<String>, cause: impl Into<failure::Error>) -> Self {
+        Self {
+            message: message.into(),
+            cause: cause.into(),
+            backtrace: failure::Backtrace::new(),
+        }
+    }
+}
+
+/// A PGP keypair.
+///
+/// This has it's own struct to be able to keep the public and secret
+/// keys together as they are one unit.
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub struct KeyPair {
+    pub addr: EmailAddress,
+    pub public: SignedPublicKey,
+    pub secret: SignedSecretKey,
+}
+
+/// Create a new key pair.
+pub(crate) fn create_keypair(addr: EmailAddress) -> std::result::Result<KeyPair, PgpKeygenError> {
+    let user_id = format!("<{}>", addr);
    let key_params = SecretKeyParamsBuilder::default()
        .key_type(PgpKeyType::Rsa(2048))
        .can_create_certificates(true)
@@ -148,20 +180,29 @@ pub fn create_keypair(addr: impl AsRef<str>) -> Option<(Key, Key)> {
                .unwrap(),
        )
        .build()
-        .expect("invalid key params");
-
-    let key = key_params.generate().expect("invalid params");
+        .map_err(|err| PgpKeygenError::new("invalid key params", failure::err_msg(err)))?;
+    let key = key_params
+        .generate()
+        .map_err(|err| PgpKeygenError::new("invalid params", err))?;
    let private_key = key.sign(|| "".into()).expect("failed to sign secret key");

    let public_key = private_key.public_key();
    let public_key = public_key
        .sign(&private_key, || "".into())
-        .expect("failed to sign public key");
+        .map_err(|err| PgpKeygenError::new("failed to sign public key", err))?;

-    private_key.verify().expect("invalid private key generated");
-    public_key.verify().expect("invalid public key generated");
+    private_key
+        .verify()
+        .map_err(|err| PgpKeygenError::new("invalid private key generated", err))?;
+    public_key
+        .verify()
+        .map_err(|err| PgpKeygenError::new("invalid public key generated", err))?;

-    Some((Key::Public(public_key), Key::Secret(private_key)))
+    Ok(KeyPair {
+        addr,
+        public: public_key,
+        secret: private_key,
+    })
 }

 /// Select public key or subkey to use for encryption.
@@ -194,7 +235,7 @@ pub fn pk_encrypt(
    plain: &[u8],
    public_keys_for_encryption: &Keyring,
    private_key_for_signing: Option<&Key>,
-) -> Result<String, Error> {
+) -> Result<String> {
    let lit_msg = Message::new_literal_bytes("", plain);
    let pkeys: Vec<SignedPublicKeyOrSubkey> = public_keys_for_encryption
        .keys()
@@ -230,12 +271,13 @@ pub fn pk_encrypt(
    Ok(encoded_msg)
 }

+#[allow(clippy::implicit_hasher)]
 pub fn pk_decrypt(
    ctext: &[u8],
    private_keys_for_decryption: &Keyring,
    public_keys_for_validation: &Keyring,
    ret_signature_fingerprints: Option<&mut HashSet<String>>,
-) -> Result<Vec<u8>, Error> {
+) -> Result<Vec<u8>> {
    let (msg, _) = Message::from_armor_single(Cursor::new(ctext))?;
    let skeys: Vec<&SignedSecretKey> = private_keys_for_decryption
        .keys()
@@ -247,7 +289,7 @@ pub fn pk_decrypt(
        .collect();

    let (decryptor, _) = msg.decrypt(|| "".into(), || "".into(), &skeys[..])?;
-    let msgs = decryptor.collect::<Result<Vec<_>, _>>()?;
+    let msgs = decryptor.collect::<pgp::errors::Result<Vec<_>>>()?;
    ensure!(!msgs.is_empty(), "No valid messages found");

    let dec_msg = &msgs[0];
@@ -279,7 +321,7 @@ pub fn pk_decrypt(
 }

 /// Symmetric encryption.
-pub fn symm_encrypt(passphrase: &str, plain: &[u8]) -> Result<String, Error> {
+pub fn symm_encrypt(passphrase: &str, plain: &[u8]) -> Result<String> {
    let mut rng = thread_rng();
    let lit_msg = Message::new_literal_bytes("", plain);

@@ -296,11 +338,11 @@ pub fn symm_encrypt(passphrase: &str, plain: &[u8]) -> Result<String, Error> {
 pub fn symm_decrypt<T: std::io::Read + std::io::Seek>(
    passphrase: &str,
    ctext: T,
-) -> Result<Vec<u8>, Error> {
+) -> Result<Vec<u8>> {
    let (enc_msg, _) = Message::from_armor_single(ctext)?;
    let decryptor = enc_msg.decrypt_with_password(|| passphrase.into())?;

-    let msgs = decryptor.collect::<Result<Vec<_>, _>>()?;
+    let msgs = decryptor.collect::<pgp::errors::Result<Vec<_>>>()?;
    ensure!(!msgs.is_empty(), "No valid messages found");

    match msgs[0].get_content()? {
@@ -312,6 +354,8 @@ pub fn symm_decrypt<T: std::io::Read + std::io::Seek>(
 #[cfg(test)]
 mod tests {
    use super::*;
+    use crate::test_utils::*;
+    use lazy_static::lazy_static;

    #[test]
    fn test_split_armored_data_1() {
@@ -339,4 +383,177 @@ mod tests {
        assert!(!base64.is_empty());
        assert_eq!(headers.get(HEADER_AUTOCRYPT), Some(&"mutual".to_string()));
    }
+
+    #[test]
+    #[ignore] // is too expensive
+    fn test_create_keypair() {
+        let keypair0 = create_keypair(EmailAddress::new("foo@bar.de").unwrap()).unwrap();
+        let keypair1 = create_keypair(EmailAddress::new("two@zwo.de").unwrap()).unwrap();
+        assert_ne!(keypair0.public, keypair1.public);
+    }
+
+    /// [Key] objects to use in tests.
+    struct TestKeys {
+        alice_secret: Key,
+        alice_public: Key,
+        bob_secret: Key,
+        bob_public: Key,
+    }
+
+    impl TestKeys {
+        fn new() -> TestKeys {
+            let alice = alice_keypair();
+            let bob = bob_keypair();
+            TestKeys {
+                alice_secret: Key::from(alice.secret.clone()),
+                alice_public: Key::from(alice.public.clone()),
+                bob_secret: Key::from(bob.secret.clone()),
+                bob_public: Key::from(bob.public.clone()),
+            }
+        }
+    }
+
+    /// The original text of [CTEXT_SIGNED]
+    static CLEARTEXT: &[u8] = b"This is a test";
+
+    lazy_static! {
+        /// Initialised [TestKeys] for tests.
+        static ref KEYS: TestKeys = TestKeys::new();
+
+        /// A cyphertext encrypted to Alice & Bob, signed by Alice.
+        static ref CTEXT_SIGNED: String = {
+            let mut keyring = Keyring::default();
+            keyring.add_owned(KEYS.alice_public.clone());
+            keyring.add_ref(&KEYS.bob_public);
+            pk_encrypt(CLEARTEXT, &keyring, Some(&KEYS.alice_secret)).unwrap()
+        };
+
+        /// A cyphertext encrypted to Alice & Bob, not signed.
+        static ref CTEXT_UNSIGNED: String = {
+            let mut keyring = Keyring::default();
+            keyring.add_owned(KEYS.alice_public.clone());
+            keyring.add_ref(&KEYS.bob_public);
+            pk_encrypt(CLEARTEXT, &keyring, None).unwrap()
+        };
+    }
+
+    #[test]
+    fn test_encrypt_signed() {
+        assert!(!CTEXT_SIGNED.is_empty());
+        assert!(CTEXT_SIGNED.starts_with("-----BEGIN PGP MESSAGE-----"));
+    }
+
+    #[test]
+    fn test_encrypt_unsigned() {
+        assert!(!CTEXT_UNSIGNED.is_empty());
+        assert!(CTEXT_UNSIGNED.starts_with("-----BEGIN PGP MESSAGE-----"));
+    }
+
+    #[test]
+    fn test_decrypt_singed() {
+        // Check decrypting as Alice
+        let mut decrypt_keyring = Keyring::default();
+        decrypt_keyring.add_ref(&KEYS.alice_secret);
+        let mut sig_check_keyring = Keyring::default();
+        sig_check_keyring.add_ref(&KEYS.alice_public);
+        let mut valid_signatures: HashSet<String> = Default::default();
+        let plain = pk_decrypt(
+            CTEXT_SIGNED.as_bytes(),
+            &decrypt_keyring,
+            &sig_check_keyring,
+            Some(&mut valid_signatures),
+        )
+        .map_err(|err| println!("{:?}", err))
+        .unwrap();
+        assert_eq!(plain, CLEARTEXT);
+        assert_eq!(valid_signatures.len(), 1);
+
+        // Check decrypting as Bob
+        let mut decrypt_keyring = Keyring::default();
+        decrypt_keyring.add_ref(&KEYS.bob_secret);
+        let mut sig_check_keyring = Keyring::default();
+        sig_check_keyring.add_ref(&KEYS.alice_public);
+        let mut valid_signatures: HashSet<String> = Default::default();
+        let plain = pk_decrypt(
+            CTEXT_SIGNED.as_bytes(),
+            &decrypt_keyring,
+            &sig_check_keyring,
+            Some(&mut valid_signatures),
+        )
+        .map_err(|err| println!("{:?}", err))
+        .unwrap();
+        assert_eq!(plain, CLEARTEXT);
+        assert_eq!(valid_signatures.len(), 1);
+    }
+
+    #[test]
+    fn test_decrypt_no_sig_check() {
+        let mut keyring = Keyring::default();
+        keyring.add_ref(&KEYS.alice_secret);
+        let empty_keyring = Keyring::default();
+        let mut valid_signatures: HashSet<String> = Default::default();
+        let plain = pk_decrypt(
+            CTEXT_SIGNED.as_bytes(),
+            &keyring,
+            &empty_keyring,
+            Some(&mut valid_signatures),
+        )
+        .unwrap();
+        assert_eq!(plain, CLEARTEXT);
+        assert_eq!(valid_signatures.len(), 0);
+    }
+
+    #[test]
+    fn test_decrypt_signed_no_key() {
+        // The validation does not have the public key of the signer.
+        let mut decrypt_keyring = Keyring::default();
+        decrypt_keyring.add_ref(&KEYS.bob_secret);
+        let mut sig_check_keyring = Keyring::default();
+        sig_check_keyring.add_ref(&KEYS.bob_public);
+        let mut valid_signatures: HashSet<String> = Default::default();
+        let plain = pk_decrypt(
+            CTEXT_SIGNED.as_bytes(),
+            &decrypt_keyring,
+            &sig_check_keyring,
+            Some(&mut valid_signatures),
+        )
+        .unwrap();
+        assert_eq!(plain, CLEARTEXT);
+        assert_eq!(valid_signatures.len(), 0);
+    }
+
+    #[test]
+    fn test_decrypt_unsigned() {
+        let mut decrypt_keyring = Keyring::default();
+        decrypt_keyring.add_ref(&KEYS.bob_secret);
+        let sig_check_keyring = Keyring::default();
+        decrypt_keyring.add_ref(&KEYS.alice_public);
+        let mut valid_signatures: HashSet<String> = Default::default();
+        let plain = pk_decrypt(
+            CTEXT_UNSIGNED.as_bytes(),
+            &decrypt_keyring,
+            &sig_check_keyring,
+            Some(&mut valid_signatures),
+        )
+        .unwrap();
+        assert_eq!(plain, CLEARTEXT);
+        assert_eq!(valid_signatures.len(), 0);
+    }
+
+    #[test]
+    fn test_decrypt_signed_no_sigret() {
+        // Check decrypting signed cyphertext without providing the HashSet for signatures.
+        let mut decrypt_keyring = Keyring::default();
+        decrypt_keyring.add_ref(&KEYS.bob_secret);
+        let mut sig_check_keyring = Keyring::default();
+        sig_check_keyring.add_ref(&KEYS.alice_public);
+        let plain = pk_decrypt(
+            CTEXT_SIGNED.as_bytes(),
+            &decrypt_keyring,
+            &sig_check_keyring,
+            None,
+        )
+        .unwrap();
+        assert_eq!(plain, CLEARTEXT);
+    }
 }
--- a/src/provider/data.rs
+++ b/src/provider/data.rs
@@ -0,0 +1,308 @@
+// file generated by src/provider/update.py
+
+use crate::provider::Protocol::*;
+use crate::provider::Socket::*;
+use crate::provider::UsernamePattern::*;
+use crate::provider::*;
+use std::collections::HashMap;
+
+lazy_static::lazy_static! {
+
+    // aktivix.org.md: aktivix.org
+    static ref P_AKTIVIX_ORG: Provider = Provider {
+        status: Status::OK,
+        before_login_hint: "",
+        after_login_hint: "",
+        overview_page: "https://providers.delta.chat/aktivix-org",
+        server: vec![
+            Server { protocol: IMAP, socket: STARTTLS, hostname: "newyear.aktivix.org", port: 143, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: STARTTLS, hostname: "newyear.aktivix.org", port: 25, username_pattern: EMAIL },
+        ],
+    };
+
+    // autistici.org.md: autistici.org
+    static ref P_AUTISTICI_ORG: Provider = Provider {
+        status: Status::OK,
+        before_login_hint: "",
+        after_login_hint: "",
+        overview_page: "https://providers.delta.chat/autistici-org",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "mail.autistici.org", port: 993, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: SSL, hostname: "smtp.autistici.org", port: 465, username_pattern: EMAIL },
+        ],
+    };
+
+    // bluewin.ch.md: bluewin.ch
+    static ref P_BLUEWIN_CH: Provider = Provider {
+        status: Status::OK,
+        before_login_hint: "",
+        after_login_hint: "",
+        overview_page: "https://providers.delta.chat/bluewin-ch",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "imaps.bluewin.ch", port: 993, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: SSL, hostname: "smtpauths.bluewin.ch", port: 465, username_pattern: EMAIL },
+        ],
+    };
+
+    // comcast.md: xfinity.com, comcast.net
+    // - skipping provider with status OK and no special things to do
+
+    // dismail.de.md: dismail.de
+    // - skipping provider with status OK and no special things to do
+
+    // disroot.md: disroot.org
+    // - skipping provider with status OK and no special things to do
+
+    // example.com.md: example.com, example.org
+    static ref P_EXAMPLE_COM: Provider = Provider {
+        status: Status::BROKEN,
+        before_login_hint: "Hush this provider doesn't exist!",
+        after_login_hint: "This provider doesn't really exist, so you can't use it :/ If you need an email provider for Delta Chat, take a look at providers.delta.chat!",
+        overview_page: "https://providers.delta.chat/example-com",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "imap.example.com", port: 1337, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: STARTTLS, hostname: "smtp.example.com", port: 1337, username_pattern: EMAIL },
+        ],
+    };
+
+    // freenet.de.md: freenet.de
+    static ref P_FREENET_DE: Provider = Provider {
+        status: Status::OK,
+        before_login_hint: "",
+        after_login_hint: "",
+        overview_page: "https://providers.delta.chat/freenet-de",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "mx.freenet.de", port: 993, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: STARTTLS, hostname: "mx.freenet.de", port: 587, username_pattern: EMAIL },
+        ],
+    };
+
+    // gmail.md: gmail.com, googlemail.com
+    static ref P_GMAIL: Provider = Provider {
+        status: Status::PREPARATION,
+        before_login_hint: "For Gmail accounts, you need to create an app-password if you have \"2-Step Verification\" enabled. If this setting is not available, you need to enable \"less secure apps\".",
+        after_login_hint: "",
+        overview_page: "https://providers.delta.chat/gmail",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "imap.gmail.com", port: 993, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: SSL, hostname: "smtp.gmail.com", port: 465, username_pattern: EMAIL },
+        ],
+    };
+
+    // gmx.net.md: gmx.net, gmx.de, gmx.at, gmx.ch, gmx.org, gmx.eu, gmx.info, gmx.biz, gmx.com
+    static ref P_GMX_NET: Provider = Provider {
+        status: Status::PREPARATION,
+        before_login_hint: "You must allow IMAP access to your account before you can login.",
+        after_login_hint: "",
+        overview_page: "https://providers.delta.chat/gmx-net",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "imap.gmx.net", port: 993, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: SSL, hostname: "mail.gmx.net", port: 465, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: STARTTLS, hostname: "mail.gmx.net", port: 587, username_pattern: EMAIL },
+        ],
+    };
+
+    // i.ua.md: i.ua
+    // - skipping provider with status OK and no special things to do
+
+    // icloud.md: icloud.com, me.com, mac.com
+    static ref P_ICLOUD: Provider = Provider {
+        status: Status::PREPARATION,
+        before_login_hint: "You must create an app-specific password for Delta Chat before you can login.",
+        after_login_hint: "",
+        overview_page: "https://providers.delta.chat/icloud",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "imap.mail.me.com", port: 993, username_pattern: EMAILLOCALPART },
+            Server { protocol: SMTP, socket: STARTTLS, hostname: "smtp.mail.me.com", port: 587, username_pattern: EMAIL },
+        ],
+    };
+
+    // kolst.com.md: kolst.com
+    // - skipping provider with status OK and no special things to do
+
+    // kontent.com.md: kontent.com
+    // - skipping provider with status OK and no special things to do
+
+    // mail.ru.md: mail.ru, inbox.ru, bk.ru, list.ru
+    // - skipping provider with status OK and no special things to do
+
+    // mailbox.org.md: mailbox.org, secure.mailbox.org
+    // - skipping provider with status OK and no special things to do
+
+    // nauta.cu.md: nauta.cu
+    static ref P_NAUTA_CU: Provider = Provider {
+        status: Status::OK,
+        before_login_hint: "",
+        after_login_hint: "Atención - con nauta.cu, puede enviar mensajes sólo a un máximo de 20 personas a la vez. En grupos más grandes, no puede enviar mensajes o abandonar el grupo.",
+        overview_page: "https://providers.delta.chat/nauta-cu",
+        server: vec![
+            Server { protocol: IMAP, socket: STARTTLS, hostname: "imap.nauta.cu", port: 143, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: STARTTLS, hostname: "smtp.nauta.cu", port: 25, username_pattern: EMAIL },
+        ],
+    };
+
+    // outlook.com.md: hotmail.com, outlook.com, office365.com, outlook.com.tr, live.com
+    static ref P_OUTLOOK_COM: Provider = Provider {
+        status: Status::BROKEN,
+        before_login_hint: "Outlook.com email addresses will not work as expected as these servers remove some important transport information. Hopefully sooner or later there will be a fix, for now we suggest to use another email address.",
+        after_login_hint: "Outlook.com email addresses will not work as expected as these servers remove some important transport information. Unencrypted 1-on-1 chats kind of work, but groups and encryption don't. Hopefully sooner or later there will be a fix, for now we suggest to use another email address.",
+        overview_page: "https://providers.delta.chat/outlook-com",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "imap-mail.outlook.com", port: 993, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: STARTTLS, hostname: "smtp-mail.outlook.com", port: 587, username_pattern: EMAIL },
+        ],
+    };
+
+    // posteo.md: posteo.de
+    static ref P_POSTEO: Provider = Provider {
+        status: Status::OK,
+        before_login_hint: "",
+        after_login_hint: "",
+        overview_page: "https://providers.delta.chat/posteo",
+        server: vec![
+            Server { protocol: IMAP, socket: STARTTLS, hostname: "posteo.de", port: 143, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: STARTTLS, hostname: "posteo.de", port: 587, username_pattern: EMAIL },
+        ],
+    };
+
+    // riseup.net.md: riseup.net
+    // - skipping provider with status OK and no special things to do
+
+    // rogers.com.md: rogers.com
+    // - skipping provider with status OK and no special things to do
+
+    // tiscali.it.md: tiscali.it
+    static ref P_TISCALI_IT: Provider = Provider {
+        status: Status::OK,
+        before_login_hint: "",
+        after_login_hint: "",
+        overview_page: "https://providers.delta.chat/tiscali-it",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "imap.tiscali.it", port: 993, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: SSL, hostname: "smtp.tiscali.it", port: 465, username_pattern: EMAIL },
+        ],
+    };
+
+    // ukr.net.md: ukr.net
+    // - skipping provider with status OK and no special things to do
+
+    // vfemail.md: vfemail.net
+    // - skipping provider with status OK and no special things to do
+
+    // web.de.md: web.de, email.de, flirt.ms, hallo.ms, kuss.ms, love.ms, magic.ms, singles.ms, cool.ms, kanzler.ms, okay.ms, party.ms, pop.ms, stars.ms, techno.ms, clever.ms, deutschland.ms, genial.ms, ich.ms, online.ms, smart.ms, wichtig.ms, action.ms, fussball.ms, joker.ms, planet.ms, power.ms
+    static ref P_WEB_DE: Provider = Provider {
+        status: Status::PREPARATION,
+        before_login_hint: "You must allow IMAP access to your account before you can login.",
+        after_login_hint: "Note: if you have your web.de spam settings too strict, you won't receive contact requests from new people. If you want to receive contact requests, you should disable the \"3-Wege-Spamschutz\" in the web.de settings.  Read how: https://hilfe.web.de/email/spam-und-viren/spamschutz-einstellungen.html",
+        overview_page: "https://providers.delta.chat/web-de",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "imap.web.de", port: 993, username_pattern: EMAILLOCALPART },
+            Server { protocol: IMAP, socket: STARTTLS, hostname: "imap.web.de", port: 143, username_pattern: EMAILLOCALPART },
+            Server { protocol: SMTP, socket: STARTTLS, hostname: "smtp.web.de", port: 587, username_pattern: EMAILLOCALPART },
+        ],
+    };
+
+    // yahoo.md: yahoo.com, yahoo.de, yahoo.it, yahoo.fr, yahoo.es, yahoo.se, yahoo.co.uk, yahoo.co.nz, yahoo.com.au, yahoo.com.ar, yahoo.com.br, yahoo.com.mx, ymail.com, rocketmail.com, yahoodns.net
+    static ref P_YAHOO: Provider = Provider {
+        status: Status::PREPARATION,
+        before_login_hint: "To use Delta Chat with your Yahoo email address you have to allow \"less secure apps\" in the Yahoo webinterface.",
+        after_login_hint: "",
+        overview_page: "https://providers.delta.chat/yahoo",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "imap.mail.yahoo.com", port: 993, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: SSL, hostname: "smtp.mail.yahoo.com", port: 465, username_pattern: EMAIL },
+        ],
+    };
+
+    // yandex.ru.md: yandex.ru, yandex.com
+    // - skipping provider with status OK and no special things to do
+
+    // ziggo.nl.md: ziggo.nl
+    static ref P_ZIGGO_NL: Provider = Provider {
+        status: Status::OK,
+        before_login_hint: "",
+        after_login_hint: "",
+        overview_page: "https://providers.delta.chat/ziggo-nl",
+        server: vec![
+            Server { protocol: IMAP, socket: SSL, hostname: "imap.ziggo.nl", port: 993, username_pattern: EMAIL },
+            Server { protocol: SMTP, socket: STARTTLS, hostname: "smtp.ziggo.nl", port: 587, username_pattern: EMAIL },
+        ],
+    };
+
+    // zoho.com.md: zoho.com
+    // - skipping provider with status OK and no special things to do
+
+    pub static ref PROVIDER_DATA: HashMap<&'static str, &'static Provider> = [
+        ("aktivix.org", &*P_AKTIVIX_ORG),
+        ("autistici.org", &*P_AUTISTICI_ORG),
+        ("bluewin.ch", &*P_BLUEWIN_CH),
+        ("example.com", &*P_EXAMPLE_COM),
+        ("example.org", &*P_EXAMPLE_COM),
+        ("freenet.de", &*P_FREENET_DE),
+        ("gmail.com", &*P_GMAIL),
+        ("googlemail.com", &*P_GMAIL),
+        ("gmx.net", &*P_GMX_NET),
+        ("gmx.de", &*P_GMX_NET),
+        ("gmx.at", &*P_GMX_NET),
+        ("gmx.ch", &*P_GMX_NET),
+        ("gmx.org", &*P_GMX_NET),
+        ("gmx.eu", &*P_GMX_NET),
+        ("gmx.info", &*P_GMX_NET),
+        ("gmx.biz", &*P_GMX_NET),
+        ("gmx.com", &*P_GMX_NET),
+        ("icloud.com", &*P_ICLOUD),
+        ("me.com", &*P_ICLOUD),
+        ("mac.com", &*P_ICLOUD),
+        ("nauta.cu", &*P_NAUTA_CU),
+        ("hotmail.com", &*P_OUTLOOK_COM),
+        ("outlook.com", &*P_OUTLOOK_COM),
+        ("office365.com", &*P_OUTLOOK_COM),
+        ("outlook.com.tr", &*P_OUTLOOK_COM),
+        ("live.com", &*P_OUTLOOK_COM),
+        ("posteo.de", &*P_POSTEO),
+        ("tiscali.it", &*P_TISCALI_IT),
+        ("web.de", &*P_WEB_DE),
+        ("email.de", &*P_WEB_DE),
+        ("flirt.ms", &*P_WEB_DE),
+        ("hallo.ms", &*P_WEB_DE),
+        ("kuss.ms", &*P_WEB_DE),
+        ("love.ms", &*P_WEB_DE),
+        ("magic.ms", &*P_WEB_DE),
+        ("singles.ms", &*P_WEB_DE),
+        ("cool.ms", &*P_WEB_DE),
+        ("kanzler.ms", &*P_WEB_DE),
+        ("okay.ms", &*P_WEB_DE),
+        ("party.ms", &*P_WEB_DE),
+        ("pop.ms", &*P_WEB_DE),
+        ("stars.ms", &*P_WEB_DE),
+        ("techno.ms", &*P_WEB_DE),
+        ("clever.ms", &*P_WEB_DE),
+        ("deutschland.ms", &*P_WEB_DE),
+        ("genial.ms", &*P_WEB_DE),
+        ("ich.ms", &*P_WEB_DE),
+        ("online.ms", &*P_WEB_DE),
+        ("smart.ms", &*P_WEB_DE),
+        ("wichtig.ms", &*P_WEB_DE),
+        ("action.ms", &*P_WEB_DE),
+        ("fussball.ms", &*P_WEB_DE),
+        ("joker.ms", &*P_WEB_DE),
+        ("planet.ms", &*P_WEB_DE),
+        ("power.ms", &*P_WEB_DE),
+        ("yahoo.com", &*P_YAHOO),
+        ("yahoo.de", &*P_YAHOO),
+        ("yahoo.it", &*P_YAHOO),
+        ("yahoo.fr", &*P_YAHOO),
+        ("yahoo.es", &*P_YAHOO),
+        ("yahoo.se", &*P_YAHOO),
+        ("yahoo.co.uk", &*P_YAHOO),
+        ("yahoo.co.nz", &*P_YAHOO),
+        ("yahoo.com.au", &*P_YAHOO),
+        ("yahoo.com.ar", &*P_YAHOO),
+        ("yahoo.com.br", &*P_YAHOO),
+        ("yahoo.com.mx", &*P_YAHOO),
+        ("ymail.com", &*P_YAHOO),
+        ("rocketmail.com", &*P_YAHOO),
+        ("yahoodns.net", &*P_YAHOO),
+        ("ziggo.nl", &*P_ZIGGO_NL),
+    ].iter().copied().collect();
+}
--- a/src/provider/mod.rs
+++ b/src/provider/mod.rs
@@ -0,0 +1,144 @@
+mod data;
+
+use crate::dc_tools::EmailAddress;
+use crate::provider::data::PROVIDER_DATA;
+
+#[derive(Debug, Copy, Clone, PartialEq, ToPrimitive)]
+#[repr(u8)]
+pub enum Status {
+    OK = 1,
+    PREPARATION = 2,
+    BROKEN = 3,
+}
+
+#[derive(Debug, PartialEq)]
+#[repr(u8)]
+pub enum Protocol {
+    SMTP = 1,
+    IMAP = 2,
+}
+
+#[derive(Debug, PartialEq)]
+#[repr(u8)]
+pub enum Socket {
+    STARTTLS = 1,
+    SSL = 2,
+}
+
+#[derive(Debug, PartialEq)]
+#[repr(u8)]
+pub enum UsernamePattern {
+    EMAIL = 1,
+    EMAILLOCALPART = 2,
+}
+
+#[derive(Debug)]
+pub struct Server {
+    pub protocol: Protocol,
+    pub socket: Socket,
+    pub hostname: &'static str,
+    pub port: u16,
+    pub username_pattern: UsernamePattern,
+}
+
+impl Server {
+    pub fn apply_username_pattern(&self, addr: String) -> String {
+        match self.username_pattern {
+            UsernamePattern::EMAIL => addr,
+            UsernamePattern::EMAILLOCALPART => {
+                if let Some(at) = addr.find('@') {
+                    return addr.split_at(at).0.to_string();
+                }
+                addr
+            }
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Provider {
+    pub status: Status,
+    pub before_login_hint: &'static str,
+    pub after_login_hint: &'static str,
+    pub overview_page: &'static str,
+    pub server: Vec<Server>,
+}
+
+impl Provider {
+    pub fn get_server(&self, protocol: Protocol) -> Option<&Server> {
+        for record in self.server.iter() {
+            if record.protocol == protocol {
+                return Some(record);
+            }
+        }
+        None
+    }
+
+    pub fn get_imap_server(&self) -> Option<&Server> {
+        self.get_server(Protocol::IMAP)
+    }
+
+    pub fn get_smtp_server(&self) -> Option<&Server> {
+        self.get_server(Protocol::SMTP)
+    }
+}
+
+pub fn get_provider_info(addr: &str) -> Option<&Provider> {
+    let domain = match addr.parse::<EmailAddress>() {
+        Ok(addr) => addr.domain,
+        Err(_err) => return None,
+    }
+    .to_lowercase();
+
+    if let Some(provider) = PROVIDER_DATA.get(domain.as_str()) {
+        return Some(*provider);
+    }
+
+    None
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_get_provider_info_unexistant() {
+        let provider = get_provider_info("user@unexistant.org");
+        assert!(provider.is_none());
+    }
+
+    #[test]
+    fn test_get_provider_info_mixed_case() {
+        let provider = get_provider_info("uSer@nAUta.Cu").unwrap();
+        assert!(provider.status == Status::OK);
+    }
+
+    #[test]
+    fn test_get_provider_info() {
+        let provider = get_provider_info("nauta.cu"); // this is no email address
+        assert!(provider.is_none());
+
+        let provider = get_provider_info("user@nauta.cu").unwrap();
+        assert!(provider.status == Status::OK);
+        let server = provider.get_imap_server().unwrap();
+        assert_eq!(server.protocol, Protocol::IMAP);
+        assert_eq!(server.socket, Socket::STARTTLS);
+        assert_eq!(server.hostname, "imap.nauta.cu");
+        assert_eq!(server.port, 143);
+        assert_eq!(server.username_pattern, UsernamePattern::EMAIL);
+        let server = provider.get_smtp_server().unwrap();
+        assert_eq!(server.protocol, Protocol::SMTP);
+        assert_eq!(server.socket, Socket::STARTTLS);
+        assert_eq!(server.hostname, "smtp.nauta.cu");
+        assert_eq!(server.port, 25);
+        assert_eq!(server.username_pattern, UsernamePattern::EMAIL);
+
+        let provider = get_provider_info("user@gmail.com").unwrap();
+        assert!(provider.status == Status::PREPARATION);
+        assert!(!provider.before_login_hint.is_empty());
+        assert!(!provider.overview_page.is_empty());
+
+        let provider = get_provider_info("user@googlemail.com").unwrap();
+        assert!(provider.status == Status::PREPARATION);
+    }
+}
--- a/src/provider/update.py
+++ b/src/provider/update.py
@@ -0,0 +1,148 @@
+#!/usr/bin/env python3
+# if the yaml import fails, run "pip install pyyaml"
+
+import sys
+import os
+import yaml
+
+out_all = ""
+out_domains = ""
+domains_dict = {}
+
+
+def cleanstr(s):
+    s = s.strip()
+    s = s.replace("\n", " ")
+    s = s.replace("\\", "\\\\")
+    s = s.replace("\"", "\\\"")
+    return s
+
+
+def file2varname(f):
+    f = f[f.rindex("/")+1:].replace(".md", "")
+    f = f.replace(".", "_")
+    f = f.replace("-", "_")
+    return "P_" + f.upper()
+
+
+def file2url(f):
+    f = f[f.rindex("/")+1:].replace(".md", "")
+    f = f.replace(".", "-")
+    return "https://providers.delta.chat/" + f
+
+
+def process_data(data, file):
+    status = data.get("status", "")
+    if status != "OK" and status != "PREPARATION" and status != "BROKEN":
+        raise TypeError("bad status")
+
+    comment = ""
+    domains = ""
+    if not "domains" in data:
+        raise TypeError("no domains found")
+    for domain in data["domains"]:
+        domain = cleanstr(domain)
+        if domain == "" or domain.count(".") < 1 or domain.lower() != domain:
+            raise TypeError("bad domain: " + domain)
+
+        global domains_dict
+        if domains_dict.get(domain, False):
+            raise TypeError("domain used twice: " + domain)
+        domains_dict[domain] = True
+
+        domains += "        (\"" + domain + "\", &*" + file2varname(file) + "),\n"
+        comment += domain + ", "
+
+
+    server = ""
+    has_imap = False
+    has_smtp = False
+    if "server" in data:
+        for s in data["server"]:
+            hostname = cleanstr(s.get("hostname", ""))
+            port = int(s.get("port", ""))
+            if hostname == "" or hostname.count(".") < 1 or port <= 0:
+                raise TypeError("bad hostname or port")
+
+            protocol = s.get("type", "").upper()
+            if protocol == "IMAP":
+                has_imap = True
+            elif protocol == "SMTP":
+                has_smtp = True
+            else:
+                raise TypeError("bad protocol")
+
+            socket = s.get("socket", "").upper()
+            if socket != "STARTTLS" and socket != "SSL":
+                raise TypeError("bad socket")
+
+            username_pattern = s.get("username_pattern", "EMAIL").upper()
+            if username_pattern != "EMAIL" and username_pattern != "EMAILLOCALPART":
+                raise TypeError("bad username pattern")
+
+            server += ("            Server { protocol: " + protocol + ", socket: " + socket + ", hostname: \""
+            + hostname + "\", port: " + str(port) + ", username_pattern: " + username_pattern + " },\n")
+
+    provider = ""
+    before_login_hint = cleanstr(data.get("before_login_hint", ""))
+    after_login_hint = cleanstr(data.get("after_login_hint", ""))
+    if (not has_imap and not has_smtp) or (has_imap and has_smtp):
+        provider += "    static ref " + file2varname(file) + ": Provider = Provider {\n"
+        provider += "        status: Status::" + status + ",\n"
+        provider += "        before_login_hint: \"" + before_login_hint + "\",\n"
+        provider += "        after_login_hint: \"" + after_login_hint + "\",\n"
+        provider += "        overview_page: \"" + file2url(file) + "\",\n"
+        provider += "        server: vec![\n" + server + "        ],\n"
+        provider += "    };\n\n"
+    else:
+        raise TypeError("SMTP and IMAP must be specified together or left out both")
+
+    if status != "OK" and before_login_hint == "":
+        raise TypeError("status PREPARATION or BROKEN requires before_login_hint: " + file)
+
+    # finally, add the provider
+    global out_all, out_domains
+    out_all += "    // " + file[file.rindex("/")+1:] + ": " + comment.strip(", ") + "\n"
+    if status == "OK" and before_login_hint == "" and after_login_hint == "" and server == "":
+        out_all += "    // - skipping provider with status OK and no special things to do\n\n"
+    else:
+        out_all += provider
+        out_domains += domains
+
+
+def process_file(file):
+    print("processing file: " + file, file=sys.stderr)
+    with open(file) as f:
+        # load_all() loads "---"-separated yamls -
+        # by coincidence, this is also the frontmatter separator :)
+        data = next(yaml.load_all(f, Loader=yaml.SafeLoader))
+        process_data(data, file)
+
+
+def process_dir(dir):
+    print("processing directory: " + dir, file=sys.stderr)
+    files = [f for f in os.listdir(dir) if f.endswith(".md")]
+    files.sort()
+    for f in files:
+        process_file(os.path.join(dir, f))
+
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        raise SystemExit("usage: update.py DIR_WITH_MD_FILES > data.rs")
+
+    out_all = ("// file generated by src/provider/update.py\n\n"
+    "use crate::provider::Protocol::*;\n"
+    "use crate::provider::Socket::*;\n"
+    "use crate::provider::UsernamePattern::*;\n"
+    "use crate::provider::*;\n"
+    "use std::collections::HashMap;\n\n"
+    "lazy_static::lazy_static! {\n\n")
+
+    process_dir(sys.argv[1])
+
+    out_all += "    pub static ref PROVIDER_DATA: HashMap<&'static str, &'static Provider> = [\n"
+    out_all += out_domains;
+    out_all += "    ].iter().copied().collect();\n}"
+
+    print(out_all)
--- a/src/qr.rs
+++ b/src/qr.rs
@@ -4,17 +4,21 @@ use lazy_static::lazy_static;
 use percent_encoding::percent_decode_str;

 use crate::chat;
+use crate::config::*;
 use crate::constants::Blocked;
 use crate::contact::*;
 use crate::context::Context;
 use crate::error::Error;
 use crate::key::dc_format_fingerprint;
-use crate::key::*;
+use crate::key::dc_normalize_fingerprint;
 use crate::lot::{Lot, LotState};
 use crate::param::*;
 use crate::peerstate::*;
+use reqwest::Url;
+use serde::Deserialize;

 const OPENPGP4FPR_SCHEME: &str = "OPENPGP4FPR:"; // yes: uppercase
+const DCACCOUNT_SCHEME: &str = "DCACCOUNT:";
 const MAILTO_SCHEME: &str = "mailto:";
 const MATMSG_SCHEME: &str = "MATMSG:";
 const VCARD_SCHEME: &str = "BEGIN:VCARD";
@@ -43,6 +47,8 @@ pub fn check_qr(context: &Context, qr: impl AsRef<str>) -> Lot {

    if qr.starts_with(OPENPGP4FPR_SCHEME) {
        decode_openpgp(context, qr)
+    } else if qr.starts_with(DCACCOUNT_SCHEME) {
+        decode_account(context, qr)
    } else if qr.starts_with(MAILTO_SCHEME) {
        decode_mailto(context, qr)
    } else if qr.starts_with(SMTP_SCHEME) {
@@ -69,7 +75,7 @@ fn decode_openpgp(context: &Context, qr: &str) -> Lot {
        (fp, &rest[1..])
    }) {
        Some(pair) => pair,
-        None => return format_err!("Invalid OPENPGP4FPR found").into(),
+        None => (payload, ""),
    };

    // replace & with \n to match expected param format
@@ -83,11 +89,11 @@ fn decode_openpgp(context: &Context, qr: &str) -> Lot {

    let addr = if let Some(addr) = param.get(Param::Forwarded) {
        match normalize_address(addr) {
-            Ok(addr) => addr,
+            Ok(addr) => Some(addr),
            Err(err) => return err.into(),
        }
    } else {
-        return format_err!("Missing address").into();
+        None
    };

    // what is up with that param name?
@@ -157,7 +163,7 @@ fn decode_openpgp(context: &Context, qr: &str) -> Lot {
            lot.state = LotState::QrFprWithoutAddr;
            lot.text1 = Some(dc_format_fingerprint(&fingerprint));
        }
-    } else {
+    } else if let Some(addr) = addr {
        if grpid.is_some() && grpname.is_some() {
            lot.state = LotState::QrAskVerifyGroup;
            lot.text1 = grpname;
@@ -172,11 +178,80 @@ fn decode_openpgp(context: &Context, qr: &str) -> Lot {
        lot.fingerprint = Some(fingerprint);
        lot.invitenumber = invitenumber;
        lot.auth = auth;
+    } else {
+        return format_err!("Missing address").into();
    }

    lot
 }

+/// scheme: `DCACCOUNT:https://example.org/new_email?t=1w_7wDjgjelxeX884x96v3`
+fn decode_account(_context: &Context, qr: &str) -> Lot {
+    let payload = &qr[DCACCOUNT_SCHEME.len()..];
+
+    let mut lot = Lot::new();
+
+    if let Ok(url) = Url::parse(payload) {
+        if url.scheme() == "https" {
+            lot.state = LotState::QrAccount;
+            lot.text1 = url.host_str().map(|x| x.to_string());
+        } else {
+            lot.state = LotState::QrError;
+            lot.text1 = Some(format!("Bad scheme for account url: {}", payload));
+        }
+    } else {
+        lot.state = LotState::QrError;
+        lot.text1 = Some(format!("Invalid account url: {}", payload));
+    }
+
+    lot
+}
+
+#[derive(Debug, Deserialize)]
+struct CreateAccountResponse {
+    email: String,
+    password: String,
+}
+
+/// take a qr of the type DC_QR_ACCOUNT, parse it's parameters,
+/// download additional information from the contained url and set the parameters.
+/// on success, a configure::configure() should be able to log in to the account
+pub fn set_config_from_qr(context: &Context, qr: &str) -> Result<(), Error> {
+    let url_str = &qr[DCACCOUNT_SCHEME.len()..];
+
+    let response = reqwest::blocking::Client::new().post(url_str).send();
+    if response.is_err() {
+        return Err(format_err!(
+            "Cannot create account, request to {} failed",
+            url_str
+        ));
+    }
+    let response = response.unwrap();
+    if !response.status().is_success() {
+        return Err(format_err!(
+            "Request to {} unsuccessful: {:?}",
+            url_str,
+            response
+        ));
+    }
+
+    let parsed: reqwest::Result<CreateAccountResponse> = response.json();
+    if parsed.is_err() {
+        return Err(format_err!(
+            "Failed to parse JSON response from {}: error: {:?}",
+            url_str,
+            parsed
+        ));
+    }
+    println!("response: {:?}", &parsed);
+    let parsed = parsed.unwrap();
+
+    context.set_config(Config::Addr, Some(&parsed.email))?;
+    context.set_config(Config::MailPw, Some(&parsed.password))?;
+
+    Ok(())
+}
+
 /// Extract address for the mailto scheme.
 ///
 /// Scheme: `mailto:addr...?subject=...&body=..`
@@ -471,4 +546,48 @@ mod tests {
        assert_eq!(contact.get_addr(), "cli@deltachat.de");
        assert_eq!(contact.get_name(), "Jörn P. P.");
    }
+
+    #[test]
+    fn test_decode_openpgp_without_addr() {
+        let ctx = dummy_context();
+
+        let res = check_qr(
+            &ctx.ctx,
+            "OPENPGP4FPR:1234567890123456789012345678901234567890",
+        );
+        assert_eq!(res.get_state(), LotState::QrFprWithoutAddr);
+        assert_eq!(
+            res.get_text1().unwrap(),
+            "1234 5678 9012 3456 7890\n1234 5678 9012 3456 7890"
+        );
+        assert_eq!(res.get_id(), 0);
+
+        let res = check_qr(&ctx.ctx, "OPENPGP4FPR:12345678901234567890");
+        assert_eq!(res.get_state(), LotState::QrError);
+        assert_eq!(res.get_id(), 0);
+    }
+
+    #[test]
+    fn test_decode_account() {
+        let ctx = dummy_context();
+
+        let res = check_qr(
+            &ctx.ctx,
+            "DCACCOUNT:https://example.org/new_email?t=1w_7wDjgjelxeX884x96v3",
+        );
+        assert_eq!(res.get_state(), LotState::QrAccount);
+        assert_eq!(res.get_text1().unwrap(), "example.org");
+    }
+
+    #[test]
+    fn test_decode_account_bad_scheme() {
+        let ctx = dummy_context();
+
+        let res = check_qr(
+            &ctx.ctx,
+            "DCACCOUNT:http://example.org/new_email?t=1w_7wDjgjelxeX884x96v3",
+        );
+        assert_eq!(res.get_state(), LotState::QrError);
+        assert!(res.get_text1().is_some());
+    }
 }
--- a/src/securejoin.rs
+++ b/src/securejoin.rs
@@ -3,7 +3,7 @@
 use percent_encoding::{utf8_percent_encode, AsciiSet, NON_ALPHANUMERIC};

 use crate::aheader::EncryptPreference;
-use crate::chat::{self, Chat};
+use crate::chat::{self, Chat, ChatId};
 use crate::config::*;
 use crate::constants::*;
 use crate::contact::*;
@@ -11,7 +11,8 @@ use crate::context::Context;
 use crate::e2ee::*;
 use crate::error::Error;
 use crate::events::Event;
-use crate::key::*;
+use crate::headerdef::HeaderDef;
+use crate::key::{dc_normalize_fingerprint, Key};
 use crate::lot::LotState;
 use crate::message::Message;
 use crate::mimeparser::*;
@@ -64,15 +65,18 @@ macro_rules! get_qr_attr {
    };
 }

-pub fn dc_get_securejoin_qr(context: &Context, group_chat_id: u32) -> Option<String> {
-    /* =========================================================
+pub fn dc_get_securejoin_qr(context: &Context, group_chat_id: ChatId) -> Option<String> {
+    /*=======================================================
    ====             Alice - the inviter side            ====
    ====   Step 1 in "Setup verified contact" protocol   ====
-    ========================================================= */
+    =======================================================*/

    let fingerprint: String;

    ensure_secret_key_exists(context).ok();
+
+    // invitenumber will be used to allow starting the handshake,
+    // auth will be used to verify the fingerprint
    let invitenumber = token::lookup_or_new(context, token::Namespace::InviteNumber, group_chat_id);
    let auth = token::lookup_or_new(context, token::Namespace::Auth, group_chat_id);
    let self_addr = match context.get_config(Config::ConfiguredAddr) {
@@ -97,7 +101,8 @@ pub fn dc_get_securejoin_qr(context: &Context, group_chat_id: u32) -> Option<Str
    let self_name_urlencoded =
        utf8_percent_encode(&self_name, NON_ALPHANUMERIC_WITHOUT_DOT).to_string();

-    let qr = if 0 != group_chat_id {
+    let qr = if !group_chat_id.is_unset() {
+        // parameters used: a=g=x=i=s=
        if let Ok(chat) = Chat::load_from_db(context, group_chat_id) {
            let group_name = chat.get_name();
            let group_name_urlencoded =
@@ -117,6 +122,7 @@ pub fn dc_get_securejoin_qr(context: &Context, group_chat_id: u32) -> Option<Str
            return None;
        }
    } else {
+        // parameters used: a=n=i=s=
        Some(format!(
            "OPENPGP4FPR:{}#a={}&n={}&i={}&s={}",
            fingerprint, self_addr_urlencoded, self_name_urlencoded, &invitenumber, &auth,
@@ -137,36 +143,41 @@ fn get_self_fingerprint(context: &Context) -> Option<String> {
    None
 }

-pub fn dc_join_securejoin(context: &Context, qr: &str) -> u32 {
+/// Take a scanned QR-code and do the setup-contact/join-group handshake.
+/// See the ffi-documentation for more details.
+pub fn dc_join_securejoin(context: &Context, qr: &str) -> ChatId {
    let cleanup =
-        |context: &Context, contact_chat_id: u32, ongoing_allocated: bool, join_vg: bool| {
+        |context: &Context, contact_chat_id: ChatId, ongoing_allocated: bool, join_vg: bool| {
            let mut bob = context.bob.write().unwrap();
            bob.expects = 0;
-            let ret_chat_id = if bob.status == DC_BOB_SUCCESS {
+            let ret_chat_id: ChatId = if bob.status == DC_BOB_SUCCESS {
                if join_vg {
                    chat::get_chat_id_by_grpid(
                        context,
                        bob.qr_scan.as_ref().unwrap().text2.as_ref().unwrap(),
                    )
+                    .unwrap_or((ChatId::new(0), false, Blocked::Not))
                    .0
                } else {
                    contact_chat_id
                }
            } else {
-                0
+                ChatId::new(0)
            };
            bob.qr_scan = None;

            if ongoing_allocated {
                context.free_ongoing();
            }
-            ret_chat_id as u32
+            ret_chat_id
        };
-    /* ==========================================================
+
+    /*========================================================
    ====             Bob - the joiner's side             =====
    ====   Step 2 in "Setup verified contact" protocol   =====
-    ========================================================== */
-    let mut contact_chat_id: u32 = 0;
+    ========================================================*/
+
+    let mut contact_chat_id = ChatId::new(0);
    let mut join_vg: bool = false;

    info!(context, "Requesting secure-join ...",);
@@ -180,11 +191,13 @@ pub fn dc_join_securejoin(context: &Context, qr: &str) -> u32 {
        error!(context, "Unknown QR code.",);
        return cleanup(&context, contact_chat_id, true, join_vg);
    }
-    contact_chat_id = chat::create_by_contact_id(context, qr_scan.id).unwrap_or_default();
-    if contact_chat_id == 0 {
-        error!(context, "Unknown contact.",);
-        return cleanup(&context, contact_chat_id, true, join_vg);
-    }
+    contact_chat_id = match chat::create_by_contact_id(context, qr_scan.id) {
+        Ok(chat_id) => chat_id,
+        Err(_) => {
+            error!(context, "Unknown contact.");
+            return cleanup(&context, contact_chat_id, true, join_vg);
+        }
+    };
    if context.shall_stop_ongoing() {
        return cleanup(&context, contact_chat_id, true, join_vg);
    }
@@ -208,10 +221,14 @@ pub fn dc_join_securejoin(context: &Context, qr: &str) -> u32 {
            .unwrap(),
        contact_chat_id,
    ) {
+        // the scanned fingerprint matches Alice's key,
+        // we can proceed to step 4b) directly and save two mails
        info!(context, "Taking protocol shortcut.");
        context.bob.write().unwrap().expects = DC_VC_CONTACT_CONFIRM;
        joiner_progress!(context, chat_id_2_contact_id(context, contact_chat_id), 400);
        let own_fingerprint = get_self_fingerprint(context).unwrap_or_default();
+
+        // Bob -> Alice
        send_handshake_msg(
            context,
            contact_chat_id,
@@ -230,6 +247,8 @@ pub fn dc_join_securejoin(context: &Context, qr: &str) -> u32 {
        );
    } else {
        context.bob.write().unwrap().expects = DC_VC_AUTH_REQUIRED;
+
+        // Bob -> Alice
        send_handshake_msg(
            context,
            contact_chat_id,
@@ -240,24 +259,30 @@ pub fn dc_join_securejoin(context: &Context, qr: &str) -> u32 {
        );
    }

-    // Bob -> Alice
-    while !context.shall_stop_ongoing() {
-        // Don't sleep too long, the user is waiting.
-        std::thread::sleep(std::time::Duration::from_millis(200));
+    if join_vg {
+        // for a group-join, wait until the secure-join is done and the group is created
+        while !context.shall_stop_ongoing() {
+            std::thread::sleep(std::time::Duration::from_millis(200));
+        }
+        cleanup(&context, contact_chat_id, true, join_vg)
+    } else {
+        // for a one-to-one-chat, the chat is already known, return the chat-id,
+        // the verification runs in background
+        context.free_ongoing();
+        contact_chat_id
    }
-    cleanup(&context, contact_chat_id, true, join_vg)
 }

 fn send_handshake_msg(
    context: &Context,
-    contact_chat_id: u32,
+    contact_chat_id: ChatId,
    step: &str,
    param2: impl AsRef<str>,
    fingerprint: Option<String>,
    grpid: impl AsRef<str>,
 ) {
    let mut msg = Message::default();
-    msg.type_0 = Viewtype::Text;
+    msg.viewtype = Viewtype::Text;
    msg.text = Some(format!("Secure-Join: {}", step));
    msg.hidden = true;
    msg.param.set_cmd(SystemMessage::SecurejoinMessage);
@@ -287,7 +312,7 @@ fn send_handshake_msg(
    chat::send_msg(context, contact_chat_id, &mut msg).unwrap_or_default();
 }

-fn chat_id_2_contact_id(context: &Context, contact_chat_id: u32) -> u32 {
+fn chat_id_2_contact_id(context: &Context, contact_chat_id: ChatId) -> u32 {
    let contacts = chat::get_chat_contacts(context, contact_chat_id);
    if contacts.len() == 1 {
        contacts[0]
@@ -299,7 +324,7 @@ fn chat_id_2_contact_id(context: &Context, contact_chat_id: u32) -> u32 {
 fn fingerprint_equals_sender(
    context: &Context,
    fingerprint: impl AsRef<str>,
-    contact_chat_id: u32,
+    contact_chat_id: ChatId,
 ) -> bool {
    let contacts = chat::get_chat_contacts(context, contact_chat_id);

@@ -318,80 +343,115 @@ fn fingerprint_equals_sender(
    }
    false
 }
-
-pub(crate) struct HandshakeMessageStatus {
-    pub(crate) hide_this_msg: bool,
-    pub(crate) delete_this_msg: bool,
-    pub(crate) stop_ongoing_process: bool,
-    pub(crate) bob_securejoin_success: Option<bool>,
+#[derive(Fail, Debug)]
+pub(crate) enum HandshakeError {
+    #[fail(display = "Can not be called with special contact ID")]
+    SpecialContactId,
+    #[fail(display = "Not a Secure-Join message")]
+    NotSecureJoinMsg,
+    #[fail(
+        display = "Failed to look up or create chat for contact #{}",
+        contact_id
+    )]
+    NoChat {
+        contact_id: u32,
+        #[cause]
+        cause: Error,
+    },
+    #[fail(display = "Chat for group {} not found", group)]
+    ChatNotFound { group: String },
+    #[fail(display = "No configured self address found")]
+    NoSelfAddr,
 }

-impl Default for HandshakeMessageStatus {
-    fn default() -> Self {
-        Self {
-            hide_this_msg: true,
-            delete_this_msg: false,
-            stop_ongoing_process: false,
-            bob_securejoin_success: None,
-        }
-    }
+/// What to do with a Secure-Join handshake message after it was handled.
+pub(crate) enum HandshakeMessage {
+    /// The message has been fully handled and should be removed/delete.
+    Done,
+    /// The message should be ignored/hidden, but not removed/deleted.
+    Ignore,
+    /// The message should be further processed by incoming message handling.
+    Propagate,
 }

 /// Handle incoming secure-join handshake.
+///
+/// This function will update the securejoin state in [Context::bob]
+/// and also terminate the ongoing process using
+/// [Context::stop_ongoing] as required by the protocol.
+///
+/// A message which results in [Err] will be hidden from the user but
+/// not deleted, it may be a valid message for something else we are
+/// not aware off.  E.g. it could be part of a handshake performed by
+/// another DC app on the same account.
+///
+/// When handle_securejoin_handshake() is called,
+/// the message is not yet filed in the database;
+/// this is done by receive_imf() later on as needed.
 pub(crate) fn handle_securejoin_handshake(
    context: &Context,
-    mimeparser: &MimeParser,
+    mime_message: &MimeMessage,
    contact_id: u32,
-) -> Result<HandshakeMessageStatus, Error> {
+) -> Result<HandshakeMessage, HandshakeError> {
    let own_fingerprint: String;

-    ensure!(
-        contact_id > DC_CONTACT_ID_LAST_SPECIAL,
-        "handle_securejoin_handshake(): called with special contact id"
-    );
-    let step = mimeparser
-        .lookup_field("Secure-Join")
-        .ok_or_else(|| format_err!("This message is not a Secure-Join message"))?;
+    if contact_id <= DC_CONTACT_ID_LAST_SPECIAL {
+        return Err(HandshakeError::SpecialContactId);
+    }
+    let step = mime_message
+        .get(HeaderDef::SecureJoin)
+        .ok_or(HandshakeError::NotSecureJoinMsg)?;

    info!(
        context,
        ">>>>>>>>>>>>>>>>>>>>>>>>> secure-join message \'{}\' received", step,
    );

-    let (contact_chat_id, contact_chat_id_blocked) =
-        chat::create_or_lookup_by_contact_id(context, contact_id, Blocked::Not).unwrap_or_default();
-
-    if contact_chat_id_blocked != Blocked::Not {
-        chat::unblock(context, contact_chat_id);
-    }
+    let contact_chat_id =
+        match chat::create_or_lookup_by_contact_id(context, contact_id, Blocked::Not) {
+            Ok((chat_id, blocked)) => {
+                if blocked != Blocked::Not {
+                    chat_id.unblock(context);
+                }
+                chat_id
+            }
+            Err(err) => {
+                return Err(HandshakeError::NoChat {
+                    contact_id,
+                    cause: err,
+                });
+            }
+        };

    let join_vg = step.starts_with("vg-");
-    let mut ret = HandshakeMessageStatus::default();

    match step.as_str() {
        "vg-request" | "vc-request" => {
-            /* =========================================================
+            /*=======================================================
            ====             Alice - the inviter side            ====
            ====   Step 3 in "Setup verified contact" protocol   ====
-            ========================================================= */
-            // this message may be unencrypted (Bob, the joinder and the sender, might not have Alice's key yet)
+            =======================================================*/
+
+            // this message may be unencrypted (Bob, the joiner and the sender, might not have Alice's key yet)
            // it just ensures, we have Bobs key now. If we do _not_ have the key because eg. MitM has removed it,
            // send_message() will fail with the error "End-to-end-encryption unavailable unexpectedly.", so, there is no additional check needed here.
            // verify that the `Secure-Join-Invitenumber:`-header matches invitenumber written to the QR code
-            let invitenumber = match mimeparser.lookup_field("Secure-Join-Invitenumber") {
+            let invitenumber = match mime_message.get(HeaderDef::SecureJoinInvitenumber) {
                Some(n) => n,
                None => {
-                    warn!(context, "Secure-join denied (invitenumber missing).",);
-                    return Ok(ret);
+                    warn!(context, "Secure-join denied (invitenumber missing)");
+                    return Ok(HandshakeMessage::Ignore);
                }
            };
            if !token::exists(context, token::Namespace::InviteNumber, &invitenumber) {
-                warn!(context, "Secure-join denied (bad invitenumber).",);
-                return Ok(ret);
+                warn!(context, "Secure-join denied (bad invitenumber).");
+                return Ok(HandshakeMessage::Ignore);
            }
            info!(context, "Secure-join requested.",);

            inviter_progress!(context, contact_id, 300);
+
+            // Alice -> Bob
            send_handshake_msg(
                context,
                contact_chat_id,
@@ -400,8 +460,15 @@ pub(crate) fn handle_securejoin_handshake(
                None,
                "",
            );
+            Ok(HandshakeMessage::Done)
        }
        "vg-auth-required" | "vc-auth-required" => {
+            /*========================================================
+            ====             Bob - the joiner's side             =====
+            ====   Step 4 in "Setup verified contact" protocol   =====
+            ========================================================*/
+
+            // verify that Alice's Autocrypt key and fingerprint matches the QR-code
            let cond = {
                let bob = context.bob.read().unwrap();
                let scan = bob.qr_scan.as_ref();
@@ -411,26 +478,26 @@ pub(crate) fn handle_securejoin_handshake(
            };

            if cond {
-                warn!(context, "auth-required message out of sync.",);
+                warn!(context, "auth-required message out of sync.");
                // no error, just aborted somehow or a mail from another handshake
-                return Ok(ret);
+                return Ok(HandshakeMessage::Ignore);
            }
            let scanned_fingerprint_of_alice = get_qr_attr!(context, fingerprint).to_string();
            let auth = get_qr_attr!(context, auth).to_string();

-            if !encrypted_and_signed(mimeparser, &scanned_fingerprint_of_alice) {
+            if !encrypted_and_signed(context, mime_message, &scanned_fingerprint_of_alice) {
                could_not_establish_secure_connection(
                    context,
                    contact_chat_id,
-                    if mimeparser.encrypted {
+                    if mime_message.was_encrypted() {
                        "No valid signature."
                    } else {
                        "Not encrypted."
                    },
                );
-                ret.stop_ongoing_process = true;
-                ret.bob_securejoin_success = Some(false);
-                return Ok(ret);
+                context.bob.write().unwrap().status = 0; // secure-join failed
+                context.stop_ongoing();
+                return Ok(HandshakeMessage::Ignore);
            }
            if !fingerprint_equals_sender(context, &scanned_fingerprint_of_alice, contact_chat_id) {
                could_not_establish_secure_connection(
@@ -438,15 +505,16 @@ pub(crate) fn handle_securejoin_handshake(
                    contact_chat_id,
                    "Fingerprint mismatch on joiner-side.",
                );
-                ret.stop_ongoing_process = true;
-                ret.bob_securejoin_success = Some(false);
-                return Ok(ret);
+                context.bob.write().unwrap().status = 0; // secure-join failed
+                context.stop_ongoing();
+                return Ok(HandshakeMessage::Ignore);
            }
            info!(context, "Fingerprint verified.",);
            own_fingerprint = get_self_fingerprint(context).unwrap();
            joiner_progress!(context, contact_id, 400);
            context.bob.write().unwrap().expects = DC_VC_CONTACT_CONFIRM;

+            // Bob -> Alice
            send_handshake_msg(
                context,
                contact_chat_id,
@@ -459,15 +527,17 @@ pub(crate) fn handle_securejoin_handshake(
                    "".to_string()
                },
            );
+            Ok(HandshakeMessage::Done)
        }
        "vg-request-with-auth" | "vc-request-with-auth" => {
-            /* ============================================================
+            /*==========================================================
            ====              Alice - the inviter side              ====
            ====   Steps 5+6 in "Setup verified contact" protocol   ====
            ====  Step 6 in "Out-of-band verified groups" protocol  ====
-            ============================================================ */
+            ==========================================================*/
+
            // verify that Secure-Join-Fingerprint:-header matches the fingerprint of Bob
-            let fingerprint = match mimeparser.lookup_field("Secure-Join-Fingerprint") {
+            let fingerprint = match mime_message.get(HeaderDef::SecureJoinFingerprint) {
                Some(fp) => fp,
                None => {
                    could_not_establish_secure_connection(
@@ -475,16 +545,16 @@ pub(crate) fn handle_securejoin_handshake(
                        contact_chat_id,
                        "Fingerprint not provided.",
                    );
-                    return Ok(ret);
+                    return Ok(HandshakeMessage::Ignore);
                }
            };
-            if !encrypted_and_signed(mimeparser, &fingerprint) {
+            if !encrypted_and_signed(context, mime_message, &fingerprint) {
                could_not_establish_secure_connection(
                    context,
                    contact_chat_id,
                    "Auth not encrypted.",
                );
-                return Ok(ret);
+                return Ok(HandshakeMessage::Ignore);
            }
            if !fingerprint_equals_sender(context, &fingerprint, contact_chat_id) {
                could_not_establish_secure_connection(
@@ -492,11 +562,11 @@ pub(crate) fn handle_securejoin_handshake(
                    contact_chat_id,
                    "Fingerprint mismatch on inviter-side.",
                );
-                return Ok(ret);
+                return Ok(HandshakeMessage::Ignore);
            }
            info!(context, "Fingerprint verified.",);
            // verify that the `Secure-Join-Auth:`-header matches the secret written to the QR code
-            let auth_0 = match mimeparser.lookup_field("Secure-Join-Auth") {
+            let auth_0 = match mime_message.get(HeaderDef::SecureJoinAuth) {
                Some(auth) => auth,
                None => {
                    could_not_establish_secure_connection(
@@ -504,12 +574,12 @@ pub(crate) fn handle_securejoin_handshake(
                        contact_chat_id,
                        "Auth not provided.",
                    );
-                    return Ok(ret);
+                    return Ok(HandshakeMessage::Ignore);
                }
            };
            if !token::exists(context, token::Namespace::Auth, &auth_0) {
                could_not_establish_secure_connection(context, contact_chat_id, "Auth invalid.");
-                return Ok(ret);
+                return Ok(HandshakeMessage::Ignore);
            }
            if mark_peer_as_verified(context, fingerprint).is_err() {
                could_not_establish_secure_connection(
@@ -517,7 +587,7 @@ pub(crate) fn handle_securejoin_handshake(
                    contact_chat_id,
                    "Fingerprint mismatch on inviter-side.",
                );
-                return Ok(ret);
+                return Ok(HandshakeMessage::Ignore);
            }
            Contact::scaleup_origin_by_id(context, contact_id, Origin::SecurejoinInvited);
            info!(context, "Auth verified.",);
@@ -525,51 +595,76 @@ pub(crate) fn handle_securejoin_handshake(
            emit_event!(context, Event::ContactsChanged(Some(contact_id)));
            inviter_progress!(context, contact_id, 600);
            if join_vg {
-                let field_grpid = mimeparser
-                    .lookup_field("Secure-Join-Group")
-                    .map(|s| s.as_str())
-                    .unwrap_or_else(|| "");
-                let (group_chat_id, _, _) = chat::get_chat_id_by_grpid(context, field_grpid);
-                if group_chat_id == 0 {
-                    error!(context, "Chat {} not found.", &field_grpid);
-                    return Ok(ret);
-                } else {
-                    if let Err(err) =
-                        chat::add_contact_to_chat_ex(context, group_chat_id, contact_id, true)
-                    {
-                        error!(context, "failed to add contact: {}", err);
+                // the vg-member-added message is special:
+                // this is a normal Chat-Group-Member-Added message
+                // with an additional Secure-Join header
+                let field_grpid = match mime_message.get(HeaderDef::SecureJoinGroup) {
+                    Some(s) => s.as_str(),
+                    None => {
+                        warn!(context, "Missing Secure-Join-Group header");
+                        return Ok(HandshakeMessage::Ignore);
+                    }
+                };
+                match chat::get_chat_id_by_grpid(context, field_grpid) {
+                    Ok((group_chat_id, _, _)) => {
+                        if let Err(err) =
+                            chat::add_contact_to_chat_ex(context, group_chat_id, contact_id, true)
+                        {
+                            error!(context, "failed to add contact: {}", err);
+                        }
+                    }
+                    Err(err) => {
+                        error!(context, "Chat {} not found: {}", &field_grpid, err);
+                        return Err(HandshakeError::ChatNotFound {
+                            group: field_grpid.to_string(),
+                        });
                    }
                }
            } else {
+                // Alice -> Bob
                send_handshake_msg(context, contact_chat_id, "vc-contact-confirm", "", None, "");
                inviter_progress!(context, contact_id, 1000);
            }
+            Ok(HandshakeMessage::Done)
        }
        "vg-member-added" | "vc-contact-confirm" => {
-            if join_vg {
-                ret.hide_this_msg = false;
-            }
+            /*=======================================================
+            ====             Bob - the joiner's side             ====
+            ====   Step 7 in "Setup verified contact" protocol   ====
+            =======================================================*/
+            let abort_retval = if join_vg {
+                HandshakeMessage::Propagate
+            } else {
+                HandshakeMessage::Ignore
+            };
+
            if context.bob.read().unwrap().expects != DC_VC_CONTACT_CONFIRM {
                info!(context, "Message belongs to a different handshake.",);
-                return Ok(ret);
+                return Ok(abort_retval);
            }
            let cond = {
                let bob = context.bob.read().unwrap();
                let scan = bob.qr_scan.as_ref();
-                scan.is_none() || join_vg && scan.unwrap().state != LotState::QrAskVerifyGroup
+                scan.is_none() || (join_vg && scan.unwrap().state != LotState::QrAskVerifyGroup)
            };
            if cond {
                warn!(
                    context,
                    "Message out of sync or belongs to a different handshake.",
                );
-                return Ok(ret);
+                return Ok(abort_retval);
            }
            let scanned_fingerprint_of_alice = get_qr_attr!(context, fingerprint).to_string();

            let vg_expect_encrypted = if join_vg {
                let group_id = get_qr_attr!(context, text2).to_string();
-                let (_, is_verified_group, _) = chat::get_chat_id_by_grpid(context, group_id);
+                // This is buggy, is_verified_group will always be
+                // false since the group is created by receive_imf by
+                // the very handshake message we're handling now.  But
+                // only after we have returned.  It does not impact
+                // the security invariants of secure-join however.
+                let (_, is_verified_group, _) = chat::get_chat_id_by_grpid(context, &group_id)
+                    .unwrap_or((ChatId::new(0), false, Blocked::Not));
                // when joining a non-verified group
                // the vg-member-added message may be unencrypted
                // when not all group members have keys or prefer encryption.
@@ -580,15 +675,15 @@ pub(crate) fn handle_securejoin_handshake(
                true
            };
            if vg_expect_encrypted
-                && !encrypted_and_signed(mimeparser, &scanned_fingerprint_of_alice)
+                && !encrypted_and_signed(context, mime_message, &scanned_fingerprint_of_alice)
            {
                could_not_establish_secure_connection(
                    context,
                    contact_chat_id,
                    "Contact confirm message not encrypted.",
                );
-                ret.bob_securejoin_success = Some(false);
-                return Ok(ret);
+                context.bob.write().unwrap().status = 0;
+                return Ok(abort_retval);
            }

            if mark_peer_as_verified(context, &scanned_fingerprint_of_alice).is_err() {
@@ -597,21 +692,26 @@ pub(crate) fn handle_securejoin_handshake(
                    contact_chat_id,
                    "Fingerprint mismatch on joiner-side.",
                );
-                return Ok(ret);
+                return Ok(abort_retval);
            }
            Contact::scaleup_origin_by_id(context, contact_id, Origin::SecurejoinJoined);
            emit_event!(context, Event::ContactsChanged(None));
-            let cg_member_added = mimeparser
-                .lookup_field("Chat-Group-Member-Added")
+            let cg_member_added = mime_message
+                .get(HeaderDef::ChatGroupMemberAdded)
                .map(|s| s.as_str())
                .unwrap_or_else(|| "");
-            if join_vg && !addr_equals_self(context, cg_member_added) {
+            if join_vg
+                && !context
+                    .is_self_addr(cg_member_added)
+                    .map_err(|_| HandshakeError::NoSelfAddr)?
+            {
                info!(context, "Message belongs to a different handshake (scaled up contact anyway to allow creation of group).");
-                return Ok(ret);
+                return Ok(abort_retval);
            }
            secure_connection_established(context, contact_chat_id);
            context.bob.write().unwrap().expects = 0;
            if join_vg {
+                // Bob -> Alice
                send_handshake_msg(
                    context,
                    contact_chat_id,
@@ -621,48 +721,56 @@ pub(crate) fn handle_securejoin_handshake(
                    "",
                );
            }
-            ret.stop_ongoing_process = true;
-            ret.bob_securejoin_success = Some(true);
+            context.bob.write().unwrap().status = 1;
+            context.stop_ongoing();
+            Ok(if join_vg {
+                HandshakeMessage::Propagate
+            } else {
+                HandshakeMessage::Done
+            })
        }
        "vg-member-added-received" => {
-            /* ============================================================
+            /*==========================================================
            ====              Alice - the inviter side              ====
            ====  Step 8 in "Out-of-band verified groups" protocol  ====
-            ============================================================ */
+            ==========================================================*/
+
            if let Ok(contact) = Contact::get_by_id(context, contact_id) {
                if contact.is_verified(context) == VerifiedStatus::Unverified {
                    warn!(context, "vg-member-added-received invalid.",);
-                    return Ok(ret);
+                    return Ok(HandshakeMessage::Ignore);
                }
                inviter_progress!(context, contact_id, 800);
                inviter_progress!(context, contact_id, 1000);
-                let field_grpid = mimeparser
-                    .lookup_field("Secure-Join-Group")
+                let field_grpid = mime_message
+                    .get(HeaderDef::SecureJoinGroup)
                    .map(|s| s.as_str())
                    .unwrap_or_else(|| "");
-                let (group_chat_id, _, _) = chat::get_chat_id_by_grpid(context, &field_grpid);
+                let (group_chat_id, _, _) = chat::get_chat_id_by_grpid(context, &field_grpid)
+                    .map_err(|err| {
+                        warn!(context, "Failed to lookup chat_id from grpid: {}", err);
+                        HandshakeError::ChatNotFound {
+                            group: field_grpid.to_string(),
+                        }
+                    })?;
                context.call_cb(Event::SecurejoinMemberAdded {
                    chat_id: group_chat_id,
-                    contact_id: contact_id,
+                    contact_id,
                });
+                Ok(HandshakeMessage::Done)
            } else {
                warn!(context, "vg-member-added-received invalid.",);
-                return Ok(ret);
+                Ok(HandshakeMessage::Ignore)
            }
        }
        _ => {
            warn!(context, "invalid step: {}", step);
+            Ok(HandshakeMessage::Ignore)
        }
    }
-
-    if ret.hide_this_msg {
-        ret.delete_this_msg = true;
-    }
-
-    Ok(ret)
 }

-fn secure_connection_established(context: &Context, contact_chat_id: u32) {
+fn secure_connection_established(context: &Context, contact_chat_id: ChatId) {
    let contact_id: u32 = chat_id_2_contact_id(context, contact_chat_id);
    let contact = Contact::get_by_id(context, contact_id);
    let addr = if let Ok(ref contact) = contact {
@@ -675,7 +783,11 @@ fn secure_connection_established(context: &Context, contact_chat_id: u32) {
    emit_event!(context, Event::ChatModified(contact_chat_id));
 }

-fn could_not_establish_secure_connection(context: &Context, contact_chat_id: u32, details: &str) {
+fn could_not_establish_secure_connection(
+    context: &Context,
+    contact_chat_id: ChatId,
+    details: &str,
+) {
    let contact_id = chat_id_2_contact_id(context, contact_chat_id);
    let contact = Contact::get_by_id(context, contact_id);
    let msg = context.stock_string_repl_str(
@@ -718,22 +830,26 @@ fn mark_peer_as_verified(context: &Context, fingerprint: impl AsRef<str>) -> Res
 * Tools: Misc.
 ******************************************************************************/

-fn encrypted_and_signed(mimeparser: &MimeParser, expected_fingerprint: impl AsRef<str>) -> bool {
-    if !mimeparser.encrypted {
-        warn!(mimeparser.context, "Message not encrypted.",);
+fn encrypted_and_signed(
+    context: &Context,
+    mimeparser: &MimeMessage,
+    expected_fingerprint: impl AsRef<str>,
+) -> bool {
+    if !mimeparser.was_encrypted() {
+        warn!(context, "Message not encrypted.",);
        false
    } else if mimeparser.signatures.is_empty() {
-        warn!(mimeparser.context, "Message not signed.",);
+        warn!(context, "Message not signed.",);
        false
    } else if expected_fingerprint.as_ref().is_empty() {
-        warn!(mimeparser.context, "Fingerprint for comparison missing.",);
+        warn!(context, "Fingerprint for comparison missing.",);
        false
    } else if !mimeparser
        .signatures
        .contains(expected_fingerprint.as_ref())
    {
        warn!(
-            mimeparser.context,
+            context,
            "Message does not match expected fingerprint {}.",
            expected_fingerprint.as_ref(),
        );
--- a/src/simplify.rs
+++ b/src/simplify.rs
@@ -0,0 +1,251 @@
+/// Remove standard (RFC 3676, §4.3) footer if it is found.
+fn remove_message_footer<'a>(lines: &'a [&str]) -> &'a [&'a str] {
+    for (ix, &line) in lines.iter().enumerate() {
+        // quoted-printable may encode `-- ` to `-- =20` which is converted
+        // back to `--  `
+        match line {
+            "-- " | "--  " => return &lines[..ix],
+            _ => (),
+        }
+    }
+    lines
+}
+
+/// Remove nonstandard footer and a boolean indicating whether such
+/// footer was removed.
+fn remove_nonstandard_footer<'a>(lines: &'a [&str]) -> (&'a [&'a str], bool) {
+    for (ix, &line) in lines.iter().enumerate() {
+        if line == "--"
+            || line == "---"
+            || line == "----"
+            || line.starts_with("-----")
+            || line.starts_with("_____")
+            || line.starts_with("=====")
+            || line.starts_with("*****")
+            || line.starts_with("~~~~~")
+        {
+            return (&lines[..ix], true);
+        }
+    }
+    (lines, false)
+}
+
+fn split_lines(buf: &str) -> Vec<&str> {
+    buf.split('\n').collect()
+}
+
+/// Simplify message text for chat display.
+/// Remove quotes, signatures, trailing empty lines etc.
+pub fn simplify(mut input: String, is_chat_message: bool) -> (String, bool) {
+    input.retain(|c| c != '\r');
+    let lines = split_lines(&input);
+    let (lines, is_forwarded) = skip_forward_header(&lines);
+
+    let lines = remove_message_footer(lines);
+    let (lines, has_nonstandard_footer) = remove_nonstandard_footer(lines);
+    let (lines, has_bottom_quote) = if !is_chat_message {
+        remove_bottom_quote(lines)
+    } else {
+        (lines, false)
+    };
+    let (lines, has_top_quote) = if !is_chat_message {
+        remove_top_quote(lines)
+    } else {
+        (lines, false)
+    };
+
+    // re-create buffer from the remaining lines
+    let text = render_message(
+        lines,
+        has_top_quote,
+        has_nonstandard_footer || has_bottom_quote,
+    );
+    (text, is_forwarded)
+}
+
+/// Skips "forwarded message" header.
+/// Returns message body lines and a boolean indicating whether
+/// a message is forwarded or not.
+fn skip_forward_header<'a>(lines: &'a [&str]) -> (&'a [&'a str], bool) {
+    if lines.len() >= 3
+        && lines[0] == "---------- Forwarded message ----------"
+        && lines[1].starts_with("From: ")
+        && lines[2].is_empty()
+    {
+        (&lines[3..], true)
+    } else {
+        (lines, false)
+    }
+}
+
+fn remove_bottom_quote<'a>(lines: &'a [&str]) -> (&'a [&'a str], bool) {
+    let mut last_quoted_line = None;
+    for (l, line) in lines.iter().enumerate().rev() {
+        if is_plain_quote(line) {
+            last_quoted_line = Some(l)
+        } else if !is_empty_line(line) {
+            break;
+        }
+    }
+    if let Some(mut l_last) = last_quoted_line {
+        if l_last > 1 && is_empty_line(lines[l_last - 1]) {
+            l_last -= 1
+        }
+        if l_last > 1 {
+            let line = lines[l_last - 1];
+            if is_quoted_headline(line) {
+                l_last -= 1
+            }
+        }
+        (&lines[..l_last], true)
+    } else {
+        (lines, false)
+    }
+}
+
+fn remove_top_quote<'a>(lines: &'a [&str]) -> (&'a [&'a str], bool) {
+    let mut last_quoted_line = None;
+    let mut has_quoted_headline = false;
+    for (l, line) in lines.iter().enumerate() {
+        if is_plain_quote(line) {
+            last_quoted_line = Some(l)
+        } else if !is_empty_line(line) {
+            if is_quoted_headline(line) && !has_quoted_headline && last_quoted_line.is_none() {
+                has_quoted_headline = true
+            } else {
+                /* non-quoting line found */
+                break;
+            }
+        }
+    }
+    if let Some(last_quoted_line) = last_quoted_line {
+        (&lines[last_quoted_line + 1..], true)
+    } else {
+        (lines, false)
+    }
+}
+
+fn render_message(lines: &[&str], is_cut_at_begin: bool, is_cut_at_end: bool) -> String {
+    let mut ret = String::new();
+    if is_cut_at_begin {
+        ret += "[...]";
+    }
+    /* we write empty lines only in case and non-empty line follows */
+    let mut pending_linebreaks = 0;
+    let mut empty_body = true;
+    for line in lines {
+        if is_empty_line(line) {
+            pending_linebreaks += 1
+        } else {
+            if !empty_body {
+                if pending_linebreaks > 2 {
+                    pending_linebreaks = 2
+                }
+                while 0 != pending_linebreaks {
+                    ret += "\n";
+                    pending_linebreaks -= 1
+                }
+            }
+            // the incoming message might contain invalid UTF8
+            ret += line;
+            empty_body = false;
+            pending_linebreaks = 1
+        }
+    }
+    if is_cut_at_end && (!is_cut_at_begin || !empty_body) {
+        ret += " [...]";
+    }
+    ret
+}
+
+/**
+ * Tools
+ */
+fn is_empty_line(buf: &str) -> bool {
+    // XXX: can it be simplified to buf.chars().all(|c| c.is_whitespace())?
+    //
+    // Strictly speaking, it is not equivalent (^A is not whitespace, but less than ' '),
+    // but having control sequences in email body?!
+    //
+    // See discussion at: https://github.com/deltachat/deltachat-core-rust/pull/402#discussion_r317062392
+    for c in buf.chars() {
+        if c > ' ' {
+            return false;
+        }
+    }
+
+    true
+}
+
+fn is_quoted_headline(buf: &str) -> bool {
+    /* This function may be called for the line _directly_ before a quote.
+    The function checks if the line contains sth. like "On 01.02.2016, xy@z wrote:" in various languages.
+    - Currently, we simply check if the last character is a ':'.
+    - Checking for the existence of an email address may fail (headlines may show the user's name instead of the address) */
+
+    buf.len() <= 80 && buf.ends_with(':')
+}
+
+fn is_plain_quote(buf: &str) -> bool {
+    buf.starts_with('>')
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use proptest::prelude::*;
+
+    proptest! {
+        #[test]
+        // proptest does not support [[:graphical:][:space:]] regex.
+        fn test_simplify_plain_text_fuzzy(input in "[!-~\t \n]+") {
+            let (output, _is_forwarded) = simplify(input, true);
+            assert!(output.split('\n').all(|s| s != "-- "));
+        }
+    }
+
+    #[test]
+    fn test_simplify_trim() {
+        let input = "line1\n\r\r\rline2".to_string();
+        let (plain, is_forwarded) = simplify(input, false);
+
+        assert_eq!(plain, "line1\nline2");
+        assert!(!is_forwarded);
+    }
+
+    #[test]
+    fn test_simplify_forwarded_message() {
+        let input = "---------- Forwarded message ----------\r\nFrom: test@example.com\r\n\r\nForwarded message\r\n-- \r\nSignature goes here".to_string();
+        let (plain, is_forwarded) = simplify(input, false);
+
+        assert_eq!(plain, "Forwarded message");
+        assert!(is_forwarded);
+    }
+
+    #[test]
+    fn test_simplify_utilities() {
+        assert!(is_empty_line(" \t"));
+        assert!(is_empty_line(""));
+        assert!(is_empty_line(" \r"));
+        assert!(!is_empty_line(" x"));
+        assert!(is_plain_quote("> hello world"));
+        assert!(is_plain_quote(">>"));
+        assert!(!is_plain_quote("Life is pain"));
+        assert!(!is_plain_quote(""));
+    }
+
+    #[test]
+    fn test_remove_top_quote() {
+        let (lines, has_top_quote) = remove_top_quote(&["> first", "> second"]);
+        assert!(lines.is_empty());
+        assert!(has_top_quote);
+
+        let (lines, has_top_quote) = remove_top_quote(&["> first", "> second", "not a quote"]);
+        assert_eq!(lines, &["not a quote"]);
+        assert!(has_top_quote);
+
+        let (lines, has_top_quote) = remove_top_quote(&["not a quote", "> first", "> second"]);
+        assert_eq!(lines, &["not a quote", "> first", "> second"]);
+        assert!(!has_top_quote);
+    }
+}
--- a/Show More
+++ b/Show More