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chatmail-core/standards.md
Daniel Kahn Gillmor 1ca835f34d Point to active Header Protection draft 
The old draft was expired and abandoned, and the new draft should be
possible to generate cleanly without breaking compatibility with old
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Standards used in Delta Chat

Some of the standards Delta Chat is based on:

Tasks Standards
Transport IMAP v4 (RFC 3501), SMTP (RFC 5321) and Internet Message Format (IMF, RFC 5322)
Proxy SOCKS5 (RFC 1928)
Embedded media MIME Document Series (RFC 2045, RFC 2046), Content-Disposition Header (RFC 2183), Multipart/Related (RFC 2387)
Text and Quote encoding Fixed, Flowed (RFC 3676)
Reactions Reaction: Indicating Summary Reaction to a Message (RFC 9078)
Filename encoding Encoded Words (RFC 2047), Encoded Word Extensions (RFC 2231)
Identify server folders IMAP LIST Extension (RFC 6154)
Push IMAP IDLE (RFC 2177)
Quota IMAP QUOTA extension (RFC 2087)
Seen status synchronization IMAP CONDSTORE extension (RFC 7162)
Client/server identification IMAP ID extension (RFC 2971)
Authorization OAuth2 (RFC 6749)
End-to-end encryption Autocrypt Level 1, OpenPGP (RFC 4880), Security Multiparts for MIME (RFC 1847) and “Mixed Up” Encryption repairing
Detect/prevent active attacks securejoin protocols
Compare public keys openpgp4fpr URI Scheme
Header encryption Header Protection for Cryptographically Protected E-mail
Configuration assistance Autoconfigure and Autodiscover
Messenger functions Chat-over-Email
Detect mailing list List-Id (RFC 2919) and Precedence (RFC 3834)
User and chat colors XEP-0392: Consistent Color Generation
Send and receive system messages Multipart/Report Media Type (RFC 6522)
Send and receive contact files vCard (RFC 6350)
Return receipts Message Disposition Notification (MDN, RFC 8098, RFC 3503) using the Chat-Disposition-Notification-To header
Locations KML (Open Geospatial Consortium, Google Dev)