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Integrated mail/groupware server

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

Related Projects

  • Courier-IMAP


LicenseVerified byVerified onNotes
License:GPLv3Genium5 December 2016

Leaders and contributors

Sam Varshavchik Maintainer

Resources and communication

AudienceResource typeURI
Bug Tracking,Developer,
Debian (Ref)
DeveloperVCS Repository Webview
DeveloperVCS Repository Webview

Software prerequisites

Required to buildexpect
Weak prerequisiteOpenSSL (for support for SSL/TLS)
Required to buildeither GDBM *or* Berkeley DB library
Weak prerequisiteOpenLDAP (support for LDAP directories)
Required to buildmake
Required to buildC++ compiler (*not* gcc 3.0)
Weak prerequisiteMySQL/PostgreSQL development libraries (support for MySQL/PostgreSQL authentication)
Required to buildPerl 5
Weak prerequisitemgetty+sendfax/groff *or* troff (not tested)/ghostscript/NetPBM (all of these for sending email messages via fax

This entry (in part or in whole) was last reviewed on 8 February 2018.


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”.

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