Setting up spam filter on individual email account through Plesk
Step 1: Enabling spam filter protection against individual email address
1. Visit the URL http://<your_domain>:8880 or https://<your_domain>:8443 (For SSL) and login.
A. Mark the option "Switch on spam filtering for this email address".
B. Select the option from the radio button "Move spam to spam folder".
B. You can input any email addresses in Black List field to enable spam filter for those email addresses.