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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)
Embedded media MIME Document Series (RFC 2045, RFC 2046), Content-Disposition Header (RFC 2183), Multipart/Related (RFC 2387)
Identify server folders IMAP LIST Extension (RFC 6154)
Push IMAP IDLE (RFC 2177)
End-to-end encryption Autocrypt Level 1, OpenPGP (RFC 4880) and Security Multiparts for MIME (RFC 1847)
Configuration assistance Autoconfigure and Autodiscover
Messenger functions Email-chat
Detect mailing list List-Id (RFC 2919) and Precedence (RFC 3834)
Send and receive system messages Multipart/Report Media Type (RFC 6522)
Return receipts Message Disposition Notification (MDN, RFC 8098, RFC 3503) using the Chat-Disposition-Notification-To header