The Emacs MIME library implements handling of various elements according to a (somewhat) large number of RFCs, drafts and standards documents. This chapter lists the relevant ones. They can all be fetched from http://quimby.gnus.org/notes/.
Standard for the Format of ARPA Internet Text Messages.
Standard for Interchange of USENET Messages
Format of Internet Message Bodies
Message Header Extensions for Non-ASCII Text
Conformance Criteria and Examples
MIME Parameter Value and Encoded Word Extensions: Character Sets, Languages, and Continuations
HZ—A Data Format for Exchanging Files of Arbitrarily Mixed Chinese and ASCII characters
Draft for the successor of RFC822
The MIME Multipart/Related Content-type
The Multipart/Report Content Type for the Reporting of Mail System Administrative Messages
Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field
Documentation of the text/plain format parameter for flowed text.