Spam Assassin is an automated mail filter that uses a wide range of heuristic algorithms on mail headers and message body text to identify "SPAM" (unsolicited email). Once identified, the mail is tagged as SPAM for later filtering using the user's desktop mail client.
For more information, please visit the developers' website: http://www.spamassassin.org
In your control panel you will be able to see the current settings for SA e.g.
Spam Assassin is currently: disabled
Spam Box is currently: disabled
Enabling the Spam Box feature will cause all mail marked by Spam Assassin as spam to be delivered to a separate mail box called 'spam'.
You can use IMAP or Horde/IMP to check messages that are routed to this box.
If you wish to use pop3 to check the spam box, just add /spam to the end of your pop3 login.
e.g. myname@mydomain.co.uk/spam
This feature's use is generally discouraged in favor of sorting and deleting spam messages using your mail client. Without Spam Box you can configure SpamAssassin to mark your email with an identifying subject (e.g. ***SPAM***), which can then be filtered out into an appropriate location.
If you simply wish to delete all mail in the spambox, click on the CLEAR SPAMBOX button in your control panel on the SpamAssassin page