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The easiest way to view current e-mail standards is to read the RFC documents (Request For Comments) for each aspect of e-mail usage. 
The RFCs are always available at:
http://www.ietf.org/rfc.html
They can also be accessed directly by using the following address:
http://www.ietf.org/rfc/rfcNNNN.txt
(Where NNNN is the RFC number prefixed with zeros as necessary to make a four digit number)
The key RFC's are:
RFC 2821 SMTP - Simple Mail Transfer Protocol
RFC 2822 Internet Message Format
RFC 1939 POP3 - Post Office Protocol version3
RFC 3501 IMAP - Internet Message Access Protocol |
