Forums discussing Mail Servers and Proxy Servers software
- Providing support for Eserv Mail Server users
- http://forum.etype.net/

Web-mail programs and discussion list
- List of open-source Web-mail systems and a discussion list regarding these, and related matters of running mail systems for (typically) large numbers of people who need these because they are highly mobile, technical unsophisticated or because they do no
- http://www.firstpr.com.au/web-mail/

Free Mail Transport Agents Compared
- This short article compares at the outermost level what are arguably the top four MTAs: Sendmail, qmail, Exim and Postfix. The author uses three of the four.
- http://shearer.org/en/writing/mtacomparison.html

Constructing an Exim configuration file from scratch
- This starts with "Hello World" in Exim, and moves on to build a useful configuration. It is one completed chapter of a dead book project.
- http://shearer.org/en/writing/eximintro.html#Understanding%20Exim%20Configuration

LAN Mail Protocols Summary FAQ
-
- http://www.faqs.org/faqs/LANs/mail-protocols/index.html

UW IMAP Information Center
- Access to IMAP (the Internet Message Access Protocol) resources at the University of Washington.
- http://www.washington.edu/imap/

The IMAP Connection
- Resources at the Univ. of Washington.
- http://www.imap.org/