Mailserver Setup Revision as of Wednesday, 26 June 2024 at 10:57 UTC

Set up with Postfix, Postgrey,
Dovecot, Cyrus SASL, ClamAV,
SpamAssassin,
Amavisd-new, and
Fail2Ban on CentOS 6.4.

Here’s a great guide
(cached).

Billy Gorbachev’s options:

Several of these changes can be made (SPF record, DROP, GnuPG) without
modifying your existing setup.