Spam Assassin Anti-SPAM Support Interface   
by SWsoft   

Add the SpamAssassin Anti-SPAM management interface to your Plesk software. Activating this on your license adds an additional Spam filter to your system that is configurable Server-wide or at the domain level.
SpamAssassin is an open source mail filter to identify spam. Using its rule base, it uses a wide range of heuristic tests on mail headers and body text to identify "SPAM".