Message Access Paradigms and Protocols - ftp://ftp.cac.washington.edu/mail/imap.vs.pop Provides background and compares the Post Office Protocol (POP) with the Internet Message Access Protocol (IMAP).
Client-Server Mail Protocols FAQ - http://www.faqs.org/faqs/mail/mailclient-faq/ A brief summary of POP3, SMTP, and IMAP, including pointers to sources and frequently-asked-questions sites.
MIME Meta-FAQ - http://www.faqs.org/faqs/mail/mime-faq/mime0/ 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.
Email Addressing FAQ - http://faqs.org/faqs/mail/addressing/ The user+box@host addressing FAQ. A discussion of what exactly is permissible and verifiable in an e-mail address.
The IMAP Connection - http://www.imap.org University of Washington collection of IMAP documentation and resources.
Internet Mail Consortium - http://www.imc.org/ Information about IMC and its members, all the Internet mail standards, and links to several IMC-hosted mailing lists.
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