My question is, which RFC documents should I start with to learn about standard practices for DNS setup on a mailserver, as well as basic SMTP practices of not blocking null senders, sending NDRs, etc.
Which RFCs are out there but no longer valid? Which have been usurped by a new RFC, etc? Thanks guys,
Don't worry about the RFCs -- they are *very* technical, and cover the minute details rather than the big picture that mailserver administrators need to know. They are vital for writing E-mail programs (mail servers, mail clients, anti-spam software, anti-virus software, etc.), but aren't meant for admins to read. If you are still interested, RFC821 and RFC822 are the two most important E-mail RFCs (with RFC2821 and RFC2822 designed to replace them eventually).
Someone really ought to put together a website covering the ins and outs of running a mailserver, but I'm not aware of any good page covering the topic.
-Scott
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