Courier For Mac

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.

Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework. Individual components can be enabled or disabled at will.

The Courier mail server now implements basic web-based calendaring and scheduling services integrated in the webmail module. Advanced groupware calendaring services will follow soon.

The Courier mail server evolved out of several related projects, that merged together (more on that later). The Courier mail server implements SMTP extensions for mailing list management and spam filtering.

The Courier mail server can function as an intermediate mail relay, relaying mail between an internal LAN and the Internet, or perform final delivery to mailboxes. The Courier mail server uses maildirs as its native mail storage format, but it can also deliver mail to legacy mailbox files as well.

The Courier mail server's configuration is set by plain text files and Perl scripts. Most of The Courier mail server's configuration can now be adjusted from a web browser, using The Courier mail server's web-based administration module.

The Courier mail server can provide mail services for regular operating system accounts. The Courier mail server can provide also mail services for virtual mail accounts, managed by an LDAP, MySQL, or PostgreSQL-based authentication database.