Useful RFCs
===========
(from ``Life with qmail'')

Internet Requests for Comment (RFC's) are the official documentation of the Internet. Most of these are well beyond the
commentary stage, and define Internet protocols such as TCP, FTP, Telnet, and the various mail standards and protocols.

RFC 821, Simple Mail Transfer Protocol (obsoleted by RFC 2821) http://www.ietf.org/rfc/rfc0821.txt
RFC 822, Standard for the Format of ARPA Internet Text Messages (obsoleted by RFC 2822) http://www.ietf.org/rfc/rfc0822.txt
RFC 931, Authentication Server. http://www.ietf.org/rfc/rfc0931.txt
RFC 974, Mail Routing and the Domain System. http://www.ietf.org/rfc/rfc0974.txt
RFC 1123, Requirements for Internet Hosts -- Application and Support. http://www.ietf.org/rfc/rfc1123.txt
RFC 1413, Identification Protocol. http://www.ietf.org/rfc/rfc1413.txt
RFC 1423, Privacy Enhancement for Internet Electronic Mail: Part III: Algorithms, Modes, and Identifiers. http://www.ietf.org/rfc/rfc1423.txt
RFC 1651, SMTP Service Extensions. http://www.ietf.org/rfc/rfc1651.txt
RFC 1652, SMTP Service Extension for 8bit-MIMEtransport. http://www.ietf.org/rfc/rfc1652.txt
RFC 1806, Content disposition. header. http://www.ietf.org/rfc/rfc1806.txt
RFC 1854, SMTP Service Extension for Command Pipelining. http://www.ietf.org/rfc/rfc1854.txt
RFC 1891, SMTP Service Extension for Delivery Status Notifications. http://www.ietf.org/rfc/rfc1891.txt
RFC 1892, The Multipart/Report Content Type for the Reporting of Mail System Administrative Messages. http://www.ietf.org/rfc/rfc1892.txt
RFC 1893, Enhanced mail system status codes. http://www.ietf.org/rfc/rfc1893.txt
RFC 1894, An Extensible Message Format for Delivery Status Notifications. http://www.ietf.org/rfc/rfc1894.txt
RFC 1939, Post Office Protocol - Version 3. http://www.ietf.org/rfc/rfc1939.txt
RFC 1985, SMTP Service Extension for Remote Message Queue Starting (ETRN). http://www.ietf.org/rfc/rfc1985.txt
RFC 1991, PGP Message Exchange Formats. http://www.ietf.org/rfc/rfc1991.txt
RFC 2015, MIME Security with Pretty Good Privacy. (PGP). http://www.ietf.org/rfc/rfc2015.txt
RFC 2045, MIME Internet message bodies. http://www.ietf.org/rfc/rfc2045.txt
RFC 2046, MIME Media Types. http://www.ietf.org/rfc/rfc2046.txt
RFC 2047, MIME Headers. http://www.ietf.org/rfc/rfc2047.txt
RFC 2048, MIME Registration Procedures. http://www.ietf.org/rfc/rfc2048.txt
RFC 2049, MIME Conformance Criteria. http://www.ietf.org/rfc/rfc2049.txt
RFC 2142, Mailbox names for common services. http://www.ietf.org/rfc/rfc2142.txt
RFC 2183, Content Disposition header. http://www.ietf.org/rfc/rfc2183.txt
RFC 2821, Simple Mail Transfer Protocol. http://www.ietf.org/rfc/rfc2821.txt
RFC 2822, Internet Message Format http://www.ietf.org/rfc/rfc2822.txt

A comprehensive list of mail-related RFC's is available from the Internet Mail Consortium at http://www.imc.org/
mail-standards.html.