Solution
1. Login to your control panel (https://www.yourdomain.com:8082)
2. Click on the “Mail” link. This will display “Mail Manager Main Menu” screen.
3. Click on “SpamAssassin“. This take you to the “Spam Message Filter Configuration” screen.
4. The “Current Status” box will tell you if Spam Assassin is currently enabled or disabled. Clicking the boxes to enable or disable Spam Assassin is how you can turn it on or off. To configure the Spam Assassin settings click the button that reads: “Configure Spam Assassin (required to rewrite subjects)”