The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, TLS, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework.

This package provides an IMAP server that accesses email stored in Maildirs format mailboxes. This server has an extremely small footprint and provides shared and virtual shared folders.

IMAP over TLS is handled by the regular IMAP daemon in conjunction with the TLS wrapper.