Open Source - Sendmail.com. Qmail: Second most popular MTA on the Internet. Qmail francophone Please note that this site is a reference for qmail users.
It's not designed to be easy to use -- it's designed to be comprehensive. There are things in here which have sharp edges! The Courier IMAP server. Copyright 1999-2008, Double Precision, Inc.
This software is distributed under the terms of the GNU General Public License. See COPYING for additional information. The Courier IMAP server is a fast, scalable, enterprise IMAP server that uses Maildirs. Courier: Main Page - doxygen documentation. Dovecot: Main Page - doxygen documentation. Popa3d - a tiny POP3 daemon.
MTA, MUA, MDA, MRA.