Spamassassin is the popular anti spam email server. Spam Assasin reliable enough to handle spam try to attack mail server.

In this tutorial to score using the following scheme :

• Kill Percent : 55%
• Tag Percent : 33%
• Subject Prefix : ***SPAM***

Subject Prefix The purpose of this is if there is one that escaped the spam in their email subject will be added *** SPAM ***.

Configuration Anti Spam below :

1. Open Zimbra Admin
2. Click Configure | Global Settings | AS/AV
3. Spam Check Setting. Set as described above
4. Save

For information detail, you can check the video tutorial below :