Cannot use Plesk Email Security extension on CloudLinux: Unsupported operating system

Symptoms

• It is impossible to use or update Plesk Email Security extension at Extensions > My Extensions > Plesk Email Security (Open):

  PLESK_ERROR: Unsupported operating system: CloudLinux

  ---

  PLESK_ERROR: Unsupported operating system: AlmaLinux

• Emails are stuck in the mail queue and can not be delivered.

Cause

Unsupported operating system. The extension is supported on RHEL/CentOS, Debian/Ubuntu only.

Resolution

• Consider installing Plesk on RHEL/CentOS, Debian/Ubuntu, or contact Plesk Sales team for a refund.

• To remove the extension:

  1. Log into Plesk

  2. Go to Extensions > My extensions > click on the Plesk Email Security extension name (not the button Open).

  3. Click More > Remove.

  Remove extension via CLI

  1. Connect to the server via SSH.

  2. Run the command:

  # plesk bin extension –uninstall email-security

• Re-queue all messages stuck in mail queue via:

  # postsuper -r ALL

Note: In order to increase probabilities to include Cloud Linux in the list of supported operating systems for the extension, take a part in the product improvement and vote for this feature by following the link: Plesk Email Security for CloudLinux.
The top-ranked suggestions are likely to be included in the next versions of Plesk.