Internet Mail Consortium - Information about IMC and its members, all the Internet mail standards, and links to several IMC-hosted mailing lists.Message Access Paradigms and Protocols - Provides extensive background and compares the Post Office Protocol (POP) with the Internet Message Access Protocol (IMAP).
Email Addressing FAQ - The user+box@host addressing FAQ. A discussion of what exactly is permissible and verifiable in an e-mail address.
The IMAP Connection - University of Washington collection of IMAP documentation and resources.
MIME Meta-FAQ - comp.mail.mime meta-FAQ: Help for MIME problems. Pointers to information about Multipurpose Internet Mail Extensions and some answers to common problems with MIME.
Mini FAQ on Client-Server Mail Protocols - A brief summary of POP3, SMTP, and IMAP, including pointers to sources and frequently-asked-questions sites.
Email Protocols Forum - Forum for the discussion of the implementation and operation of e-mail systems.
Detailed Revision/Update of Message Standards - The charter of the DRUMS IETF working group. DRUMS works on clarifying, codifying, and extending existing Internet messaging standards.
Network Services and Applications - A series of lecture notes and slides from the Faculty of Informatics and Communication, Central Queensland University. Covers many mail protocols.
SMTP - An extensive tutorial on the Simple Mail Transfer Protocol.
