1)   RelayTest 1.9.4
RelayTest Pro is a tool for network administrators, that allows to test a specified mail server for open relays. It runs series of tests designed to detect open relays and create a detailed report of the findings.

 2)   mxORB 2.2.3
mxORB is a server-side spam filter that consistently blocks over 98% of unsolicited commercial email (also known as spam) at a fraction of the cost of other filtering solutions.

 3)   RBLcheck 1.0.3
RBLCheck will check if one or more of your IP address / domains exists in the well-known Realtime Blackhole Lists (RBL). It can automatically start up with Windows and perform a routine check in the background.

 4)   BlackMail 1.0.0
Delete SPAM using a domain blacklist. Automatically extract domains from emails and add them to a blacklist.

 5)   ORF Enterprise Edition 2.1
ORF Enterprise Edition is an enterprise-level anti-spam solution that helps you to block spam before it reaches your network. ORF uses a combination of anti-spam technologies to stop the spam on SMTP protocol level.