Spam Assassin is a mail filter installed on a mail server used to identify spam. It checks for spam using a large number of pre-set rules that check the header, body, and sender of all e-mail messages sent to your domain mailbox.
For more information about Spam Assassin, refer to the following links:
Spam Assassin - Spam Assassin web site.
Spam Assassin rules - A list of all the rules that Spam Assassin currently uses.
Also refer to E-mail Filtering for more information about spam and setting up filters.
To enable Spam Assassin:
Click on the Spam Assassin link in the Mail area.
Click on the Enable Spam Assassin button.