diff --git a/deltachat-rpc-client/tests/conftest.py b/deltachat-rpc-client/tests/conftest.py
index 19b106728..e221f7292 100644
--- a/deltachat-rpc-client/tests/conftest.py
+++ b/deltachat-rpc-client/tests/conftest.py
@@ -24,8 +24,16 @@ class DirectImap:
 
     def __init__(self, account: Account, addr=None, password=None) -> None:
         self.account = account
-        self.addr = addr or account.get_config("addr")
-        self.password = password or account.get_config("mail_pw")
+        if addr is None or password is None:
+            transport = account.list_transports()[-1]
+        if addr is None:
+            self.addr = transport["addr"]
+        else:
+            self.addr = addr
+        if password is None:
+            self.password = transport["password"]
+        else:
+            self.password = password
         self.logid = account.get_config("displayname") or id(account)
         self._idling = False
         self.connect()
diff --git a/deltachat-rpc-client/tests/test_securejoin.py b/deltachat-rpc-client/tests/test_securejoin.py
index 15664c734..0d7d84866 100644
--- a/deltachat-rpc-client/tests/test_securejoin.py
+++ b/deltachat-rpc-client/tests/test_securejoin.py
@@ -27,7 +27,7 @@ def test_qr_setup_contact(acf) -> None:
 
 def test_qr_setup_contact_svg(acf) -> None:
     alice = acf.new_configured_account()
-    _, _, domain = alice.get_config("addr").rpartition("@")
+    _, _, domain = alice.list_transports()[0]["addr"].rpartition("@")
 
     _qr_code, svg = alice.get_qr_code_svg()
 
@@ -43,6 +43,7 @@ def test_qr_setup_contact_svg(acf) -> None:
 def test_qr_securejoin(acf):
     alice, bob, fiona = acf.get_online_accounts(3)
 
+    alice.set_config("displayname", "Alice")
     # Setup second device for Alice
     # to test observing securejoin protocol.
     alice2 = alice.clone()
@@ -67,7 +68,7 @@ def test_qr_securejoin(acf):
     assert alice_contact_bob_snapshot.e2ee_avail
 
     snapshot = bob.wait_for_incoming_msg().get_snapshot()
-    assert snapshot.text == "You were added by {}.".format(alice.get_config("addr"))
+    assert snapshot.text == "You were added by Alice."
 
     bob_contact_alice = bob.create_contact(alice)
     bob_contact_alice_snapshot = bob_contact_alice.get_snapshot()
@@ -503,11 +504,9 @@ def test_aeap_flow(acf):
     assert msg_in_1.text == msg_out.text
 
     logging.info("changing email account")
-    ac1.set_config("addr", addr)
-    ac1.set_config("mail_pw", password)
-    ac1.stop_io()
-    ac1.configure()
-    ac1.start_io()
+    old_addr = ac1.list_transports()[0]["addr"]
+    ac1.add_transport_from_qr(acf.get_account_qr())
+    ac1.delete_transport(old_addr)
 
     logging.info("sending second message")
     msg_out = chat.send_text("changed address").get_snapshot()
@@ -529,6 +528,7 @@ def test_securejoin_after_contact_resetup(acf) -> None:
     but different key fingerprint while a securejoin with that contact is still pending.
     """
     ac1, ac2, ac3 = acf.get_online_accounts(3)
+    ac3.set_config("displayname", "ac3")
 
     # ac3 creates a group with ac1.
     ac3_chat = ac3.create_group("Group")
@@ -540,7 +540,7 @@ def test_securejoin_after_contact_resetup(acf) -> None:
 
     # ac1 waits for member added message and creates a QR code.
     snapshot = ac1.wait_for_incoming_msg().get_snapshot()
-    assert snapshot.text == "You were added by {}.".format(ac3.get_config("addr"))
+    assert snapshot.text == "You were added by ac3."
     ac1_qr_code = snapshot.chat.get_qr_code()
 
     # ac2 sets up contact with ac1
@@ -580,6 +580,8 @@ def test_securejoin_after_contact_resetup(acf) -> None:
 
 def test_withdraw_securejoin_qr(acf):
     alice, bob = acf.get_online_accounts(2)
+    alice.set_config("displayname", "Alice")
+    bob.set_config("displayname", "Bob")
 
     logging.info("Alice creates a group")
     alice_chat = alice.create_group("Group")
@@ -592,11 +594,11 @@ def test_withdraw_securejoin_qr(acf):
     alice.clear_all_events()
 
     snapshot = bob.wait_for_incoming_msg().get_snapshot()
-    assert snapshot.text == "You were added by {}.".format(alice.get_config("addr"))
+    assert snapshot.text == "You were added by Alice."
     bob_chat.leave()
 
     snapshot = alice.get_message_by_id(alice.wait_for_msgs_changed_event().msg_id).get_snapshot()
-    assert snapshot.text == "Group left by {}.".format(bob.get_config("addr"))
+    assert snapshot.text == "Group left by Bob."
 
     logging.info("Alice withdraws QR code.")
     qr = alice.check_qr(qr_code)
diff --git a/deltachat-rpc-client/tests/test_something.py b/deltachat-rpc-client/tests/test_something.py
index 541497a83..6918ca23b 100644
--- a/deltachat-rpc-client/tests/test_something.py
+++ b/deltachat-rpc-client/tests/test_something.py
@@ -155,7 +155,7 @@ def test_list_transports(acf) -> None:
 def test_account(acf) -> None:
     alice, bob = acf.get_online_accounts(2)
 
-    bob_addr = bob.get_config("addr")
+    bob_addr = bob.get_config("configured_addr")
     alice_contact_bob = alice.create_contact(bob, "Bob")
     alice_chat_bob = alice_contact_bob.create_chat()
     alice_chat_bob.send_text("Hello!")
@@ -318,7 +318,7 @@ def test_chat(acf) -> None:
 def test_contact(acf) -> None:
     alice, bob = acf.get_online_accounts(2)
 
-    bob_addr = bob.get_config("addr")
+    bob_addr = bob.get_config("configured_addr")
     alice_contact_bob = alice.create_contact(bob, "Bob")
 
     assert alice_contact_bob == alice.get_contact_by_id(alice_contact_bob.id)
@@ -604,7 +604,6 @@ def test_import_export_online_all(acf, tmp_path, rpcdata, log) -> None:
     (ac1, some1) = acf.get_online_accounts(2)
 
     log.section("create some chat content")
-    some1_addr = some1.get_config("addr")
     chat1 = ac1.create_contact(some1).create_chat()
     chat1.send_text("msg1")
     assert len(ac1.get_contacts()) == 1
@@ -622,7 +621,6 @@ def test_import_export_online_all(acf, tmp_path, rpcdata, log) -> None:
         contacts = ac.get_contacts()
         assert len(contacts) == 1
         contact2 = contacts[0]
-        assert contact2.get_snapshot().address == some1_addr
         chat2 = contact2.create_chat()
         messages = chat2.get_messages()
         assert len(messages) == 3 + E2EE_INFO_MSGS
diff --git a/src/configure.rs b/src/configure.rs
index 1965b51d7..dc39b2f7a 100644
--- a/src/configure.rs
+++ b/src/configure.rs
@@ -155,9 +155,7 @@ impl Context {
             .await;
 
         self.free_ongoing().await;
-        res?;
-
-        param.save_legacy(self).await
+        res
     }
 
     /// Adds a new email account as a transport
diff --git a/src/login_param.rs b/src/login_param.rs
index eb8ec5d22..744ba3291 100644
--- a/src/login_param.rs
+++ b/src/login_param.rs
@@ -9,14 +9,12 @@
 use std::fmt;
 
 use anyhow::{Context as _, Result};
-use num_traits::ToPrimitive as _;
 use serde::{Deserialize, Serialize};
 
 use crate::config::Config;
 use crate::context::Context;
 pub use crate::net::proxy::ProxyConfig;
 pub use crate::provider::Socket;
-use crate::tools::ToOption;
 
 /// User-entered setting for certificate checks.
 ///
@@ -232,62 +230,6 @@ impl EnteredLoginParam {
             oauth2: false,
         })
     }
-
-    /// Saves entered account settings,
-    /// so that they can be prefilled if the user wants to configure the server again.
-    ///
-    /// This is needed in case a UI is not yet updated, and still uses `get_config("mail_pw")` etc.
-    /// in order to prefill the entered account settings.
-    pub(crate) async fn save_legacy(&self, context: &Context) -> Result<()> {
-        context.set_config(Config::Addr, Some(&self.addr)).await?;
-
-        context
-            .set_config(Config::MailServer, self.imap.server.to_option())
-            .await?;
-        context
-            .set_config(Config::MailPort, self.imap.port.to_option().as_deref())
-            .await?;
-        context
-            .set_config(
-                Config::MailSecurity,
-                self.imap.security.to_i32().to_option().as_deref(),
-            )
-            .await?;
-        context
-            .set_config(Config::MailUser, self.imap.user.to_option())
-            .await?;
-        context
-            .set_config(Config::MailPw, self.imap.password.to_option())
-            .await?;
-
-        context
-            .set_config(Config::SendServer, self.smtp.server.to_option())
-            .await?;
-        context
-            .set_config(Config::SendPort, self.smtp.port.to_option().as_deref())
-            .await?;
-        context
-            .set_config(
-                Config::SendSecurity,
-                self.smtp.security.to_i32().to_option().as_deref(),
-            )
-            .await?;
-        context
-            .set_config(Config::SendUser, self.smtp.user.to_option())
-            .await?;
-        context
-            .set_config(Config::SendPw, self.smtp.password.to_option())
-            .await?;
-
-        context
-            .set_config(
-                Config::ImapCertificateChecks,
-                self.certificate_checks.to_i32().to_option().as_deref(),
-            )
-            .await?;
-
-        Ok(())
-    }
 }
 
 impl fmt::Display for EnteredLoginParam {
@@ -369,41 +311,4 @@ mod tests {
 
         Ok(())
     }
-
-    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-    async fn test_save_entered_login_param() -> Result<()> {
-        let t = TestContext::new().await;
-        let param = EnteredLoginParam {
-            addr: "alice@example.org".to_string(),
-            imap: EnteredImapLoginParam {
-                server: "".to_string(),
-                port: 0,
-                folder: "".to_string(),
-                security: Socket::Starttls,
-                user: "".to_string(),
-                password: "foobar".to_string(),
-            },
-            smtp: EnteredSmtpLoginParam {
-                server: "".to_string(),
-                port: 2947,
-                security: Socket::default(),
-                user: "".to_string(),
-                password: "".to_string(),
-            },
-            certificate_checks: Default::default(),
-            oauth2: false,
-        };
-        param.save_legacy(&t).await?;
-        assert_eq!(
-            t.get_config(Config::Addr).await?.unwrap(),
-            "alice@example.org"
-        );
-        assert_eq!(t.get_config(Config::MailPw).await?.unwrap(), "foobar");
-        assert_eq!(t.get_config(Config::SendPw).await?, None);
-        assert_eq!(t.get_config_int(Config::SendPort).await?, 2947);
-
-        assert_eq!(EnteredLoginParam::load_legacy(&t).await?, param);
-
-        Ok(())
-    }
 }
diff --git a/src/tools.rs b/src/tools.rs
index 14f964199..f4050a49f 100644
--- a/src/tools.rs
+++ b/src/tools.rs
@@ -520,32 +520,6 @@ where
     }
 }
 
-pub(crate) trait ToOption<T> {
-    fn to_option(self) -> Option<T>;
-}
-impl<'a> ToOption<&'a str> for &'a String {
-    fn to_option(self) -> Option<&'a str> {
-        if self.is_empty() { None } else { Some(self) }
-    }
-}
-impl ToOption<String> for u16 {
-    fn to_option(self) -> Option<String> {
-        if self == 0 {
-            None
-        } else {
-            Some(self.to_string())
-        }
-    }
-}
-impl ToOption<String> for Option<i32> {
-    fn to_option(self) -> Option<String> {
-        match self {
-            None | Some(0) => None,
-            Some(v) => Some(v.to_string()),
-        }
-    }
-}
-
 #[expect(clippy::arithmetic_side_effects)]
 pub(crate) fn remove_subject_prefix(last_subject: &str) -> String {
     let subject_start = if last_subject.starts_with("Chat:") {