Binary package “courier-mta” in ubuntu precise
Courier mail server - ESMTP daemon
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.
This package provides an ESMTP daemon which uses the Maildir format
as native storage format, supports IPv6, implements SMTP extensions
for mailing list management and features integrated mail filtering.
It can function as an intermediate mail relay, relaying mail
between an internal LAN and the Internet, or perform final delivery