To enable Spam filter on E-mail address in the plesk control panel, please follow the following steps :-
1) Login to Plesk Control Panel.

2) Click on "Mail Tab" and click on "E-mail Address".

5) Click on Spam Filter Tab and then Click on "Switch on spam filtering for this e-mail address"

6) Once you have entere the above details click on "OK" and email account will be configured.
For Flash tutorial : Click here.
