SpamAssassin for Windows is a powerful e-mail filter which attempts to identify spam using a variety of mechanisms including text analysis, Bayesian filtering, DNS blocklists, and collaborative filtering databases.

SpamAssassin is a project of the Apache Software Foundation (ASF) and was adapted for Windows by JAM Software. In combination with an MTA (Mail Transport Agent), e.g. Hamster or MS Exchange, it is a very effective anti-spam solution. The freeware contains, beside several modules, the following SpamAssassin components as executable files for Windows (.exe):
1. spamassassin.exe (mail filter)
2. spamd.exe (SpamAssassin as a server process (daemon))
3. WinSpamC.exe (client for spamd)
4. sa-update.exe (SpamAssassin rule updates)
5. sa-learn.exe (trains Bayes filter with spam/ham mail)

Please note: SpamAssassin for Windows is not a mail router and should be watched by a service when used in a productive server. For professional use or if you need additional functionality, try SmartPOP2Exchange or Exchange Server Toolbox. Both include SpamAssassin which is already preconfigured in the installation.

The license of this software is Freeware, you can free download and free use this anti spam software.