See also:
  • http://www.faqs.org/faqs/mail/mailclient-faq/
    Client-Server Mail Protocols FAQ - A brief summary of POP3, SMTP, and IMAP, including pointers to sources and frequently-asked-questions sites.
  • http://faqs.org/faqs/mail/addressing/
    Email Addressing FAQ - The user+box@host addressing FAQ. A discussion of what exactly is permissible and verifiable in an e-mail address.
  • http://www.imc.org/
    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 background and compares the Post Office Protocol (POP) with the Internet Message Access Protocol (IMAP).
  • http://www.faqs.org/faqs/mail/mime-faq/mime0/
    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.
  • http://www.mythic-beasts.com/~pdw/cgi-bin/emailvalidate
    RFC822 Email Address Validator - Online service to check if an email address follows the syntax laid down in RFC822.