sendmail.org is a good place to go. The RFCs at rtfm.mit.edu (I think
that is where they are) also are a good source. The one you would want
would be 822 to start. It will probably lead you into others.
On Wed, 24 Jun 1998, Bernard El-Hagin wrote:
Can anyone direct me to documents on the Net that *thoroughly*
talk about e-mail, MUAs, MTAs, etc? What I need is something that will
teach me as much about the "hows-and-whys" of e-mail as possible.
"When you're not looking this sentence is in Spanish."