Symptoms
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The following warning is received while creating a mailbox in Plesk:
Warning: Unable to apply the Mail Anti-Virus settings because you have reached the maximum number of mailboxes defined by your Premium antivirus license key.
Cause
A free version of the Premium Anti-Virus for Servers extension is installed on the server which has limitations.
Resolution
If the extension is planned to be used further, consider purchasing a license.
If the extension is not planned to be used further, remove the Premium Anti-Virus for Servers extension.