How to Enable the Spam Filter in Plesk
The Spam Filter that’s built in to Plesk allows you to filter spam emails before they hit your email account, as well as blacklist any annoying email addresses.
First, login to Plesk.
Now navigate to the Mail tab.
Select the email address you want to enable spam filtering for, and click the Spam Filter tab.
Next click ‘Switch on spam filtering for this email address‘.
Finally, scroll down and click Apply.
The spam filter will now be active on this domain name for all incoming emails.