A brief summary of POP3, SMTP, and IMAP, including pointers to sources and frequently-asked-questions sites.

The user+box@host addressing FAQ. A discussion of what exactly is permissible and verifiable in an e-mail address.

Information about IMC and its members, all the Internet mail standards, and links to several IMC-hosted mailing lists.

Provides background and compares the Post Office Protocol (POP) with the Internet Message Access Protocol (IMAP).

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.

Online service to check if an email address follows the syntax laid down in RFC822.

University of Washington collection of IMAP documentation and resources.