Standards used in Delta Chat
For everyone, who’s technically interested, here are some of the standards Delta Chat is based on.
|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 v0.9.0|
|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)|
Delta Chat itself is licensed under the GPL license. If you want to know, whether a concrete feature is supported, a look into the source code may help.