Anti-Spam SMTP Proxy Server implements multiple spam filters
Powerful Open Source Email Marketing app with analytics & segmentation
mailbox synchronizer
Gross greylisting server
Strong Email & Apache Log Analysis with Active Security Features
software for email automation (newsletters, transaction mails, etc.)
command line tool to manage email (alias-)domains/accounts/aliases …
secure, reliable, fast MTA
JavaScript/XML engine for Apache
Full SMTP/Mail server Appliance in 5 minutes
An easy-to-use anti-spam email gateway
Petidomo is a small, easy-to-administer mailing list server
an 'auto-reply' bot for your mail server