courier-imap - 5.0.13+1.0.16-3+b6 main

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