SpamAssasin service does not start in Plesk after Plesk Email Security instllation

Symptoms

After installing Plesk Email Security, SpamAssassin service does not start at Tools & Settings > Services Management: when clicking the play button next to SpamAssassin service nothing happens.

Cause

This is expected behavior.

As Plesk Email Security extension is installed, Amavis (mail content filter shipped by Plesk Email Security) uses its own spamassassin-daemon.
There is no need to configure or start SpamAssassin manually.

Plesk Email Security shows the following message during the installation:

PLESK_INFO: Please note: Plesk Email Security requires Dovecot and Postfix, shipped as components with Plesk, on a Linux server. The extension works independently from Plesk's built-in SpamAssassin component. This extension disables the user interface and the rules added by the component if installed! You don't have to install or uninstall the SpamAssassin component to use Plesk Email Security properly. The Greylisting functionality does not work with Email Security and is disabled in the installation process.

Resolution

No actions required.