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Postfix is Wietse Venema's mailer that started life as an alternative to the widely-used Sendmail program. Postfix attempts to be fast, easy to administer, and secure, while at the same time being sendmail compatible enough to not upset existing users. Thus, the outside has a sendmail-ish flavor, but the inside is completely different.
Dovecot is an open source IMAP and POP3 server for Linux/UNIX-like systems, written with security primarily in mind.
qmail is a modern SMTP server which makes sendmail obsolete, written by Dan Bernstein. Qmail was released under the public domain in november 2007.
popa3d is a tiny POP3 daemon for Unix-like operating systems. It was designed with security as the primary goal. popa3d has been integrated into OpenBSD base tree. It is the default POP3 server on Openwall GNU/*/Linux (Owl), recent versions of Slackware, and distributions by ALT Linux team. ... [More]