How to Enable SpamAssassin to work on the domain level

Problem: How to enable get SpamAssassin to work on the domain level in plesk?
Issue: SpamAssassin is disabled in the domain's Mail Settings.

Solution:
* First check that SpamAssassin is indeed running on your server. Login to your Plesk control panel. Navigate to the Server > Services management page. Look in the list of services for SpamAssassin. It should have an icon that indicates that it is running. If it isn't, contact PowerVPS's Support.
* Next, navigate to the domain which you wish SpamAssassin to be enabled for. Click on the Mail link (Domains > yourdomain.com).
* Select the email account which you wish to enable spam filtering for.
* Click on the Mailbox link. You should be at the following page:
Domains > yourdomain.com > Mail > youraccount@yourdomain.com >
* The option "Enable spam filtering" should now be available. Click the check box and the OK button.