Courier - Free Software Directory

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The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. It provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework. Individual components can be enabled or disabled at will. Courier now implements basic web-based calendaring and scheduling services integrated in the webmail module. Courier implements SMTP extensions for mailing list management and spam filtering. Courier can function as an intermediate mail relay, relaying mail between an internal LAN and the Internet, or perform final delivery to mailboxes. Courier uses maildirs as its native mail storage format, but it can also deliver mail to legacy mailbox files as well. Courier's configuration is set by plain text files and Perl scripts. Most of Courier's configuration can now be adjusted from a web browser, using Courier's web-based administration module.


User INSTALL guide included and available in HTML format from; User FAQ available in HTML format from; User manpages available in HTML format from


Download version 0.49.0 (stable)
released on 4 March 2005

VCS Checkout


Related Projects


LicenseVerified byVerified onNotes
GPLv2orlaterJanet Casey2 August 2002

Leaders and contributors

Sam Varshavchik Maintainer

Resources and communication

Audience Resource type URI
Developer VCS Repository Webview
Bug Tracking,Developer,Support E-mail

Software prerequisites

Kind Description
Weak prerequisite mgetty+sendfax/groff *or* troff (not tested)/ghostscript/NetPBM (all of these for sending email messages via fax
Required to build expect
Weak prerequisite OpenSSL (for support for SSL/TLS)
Required to build either GDBM *or* Berkeley DB library
Weak prerequisite OpenLDAP (support for LDAP directories)
Required to build make
Required to build C++ compiler (*not* gcc 3.0)
Weak prerequisite MySQL/PostgreSQL development libraries (support for MySQL/PostgreSQL authentication)
Required to build Perl 5

This entry (in part or in whole) was last reviewed on 4 March 2005.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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