A simple and fast cross-platform solution to send mass emails.
The first Open-Source high-performance MTA for high-volume senders
An unofficial web console to administer Apache James 3 server
Go Gmailer is a java based desktop app to send emails.
Ciphermail email encryption gateway (S/MIME, OpenPGP, PDF encryption)
CRM114 milter for sendmail
QSF milter for sendmail
PHP powerful tool for sending e-mails fast and easily