Mail Server
These packages allow you to configure an IMAP or SMTP mail server.
- cyrus-sasl - The Cyrus SASL library
 - dovecot - Dovecot Secure imap server
 - esmtp - User configurable relay-only Mail Transfer Agent (MTA)
 - exim - The exim mail transfer agent
 - postfix - Postfix Mail Transport Agent
 - sendmail - A widely used Mail Transport Agent (MTA)
 - sendmail-cf - The files needed to reconfigure Sendmail
 - spamassassin - Spam filter for email which can be invoked from mail delivery agents.
 - spambayes - Bayesian anti-spam filter