Additional user cannot manage Plesk Email Security individual settings: Access denied

Symptoms

Accessing Domains > example.com > Mail > Mail Adresses > [email protected] > Settings under additional Plesk user shows the error:

Access Denied

Cause

Plesk Email Security extension bugs EXTCERT-2884 and EXTPLESK-4120 that have been fixed.

Resolution

Update the Plesk Email Security extension to the latest version.