Auto Whitelist automates the detection of safe/valid email addresses by plugging into Postfix and monitoring sent mail and building a whitelist. It then automatically tags all incoming email with information regarding the senders email address status.
Complete mail business rules processor and MTA. Also provides antivirus (ClamAV) and anti spam (Spamassassin) solutions. Based in Java and OSGI with Spring DM and MySQL data base for statistics. Can be easily extended.
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MailPing monitors SMTP mail hubs and relays from a user's point
of view by sending SMTP messages to the servers that it monitors, looking for
the messages to come back (and notifies if they don't), and calculates
round trip times.