
72 Chapter 2 Mail Service Maintenance
Internet
There is an abundance of information about the different mail protocols, DNS, and
other related topics on the Internet.
A high level overview of email systems can be found at this website:
www.wikipedia.org
Request for Comments (RFC) documents provide an overview of a protocol or service
and details about how the protocol should behave. If you’re a novice server
administrator, you may find some of the RFC background information helpful. If you’re
an experienced server administrator, you’ll find all the technical details about a protocol
in its RFC document. You can search for RFC documents by number at this website:
www.faqs.org/rfcs
For technical details about how mail protocols work, see these RFC documents:
• POP: RFC 1725
• IMAP: RFC 2060
• SMTP: RFC 821 and RFC 822
• Sieve: RFC 3028
For more information about Postfix, go to:
www.postfix.org
For more information about Cyrus, go to:
asg.web.cmu.edu/cyrus
For more information about Sendmail, go to:
www.sendmail.org
For more information about SquirrelMail, go to:
www.squirrelmail.org
For more information about Sieve, go to:
www.cyrusoft.com/sieve
You can find out more about servers that filter junk mail at this website:
www.ordb.org
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