Unable to install Plesk Email Security: Access denied

Symptoms

• Extensions > Plesk Email Security > Install Now returns:

  Access denied

Cause

Mailbox [email protected] still exists in SpamAssassin database but it does not exist in Domains > example.com > Mail > Email Addresses

Resolution

1. Log into Plesk
2. Re-create [email protected] in Domains > example.com > Mail > Email Addresses
3. Install Plesk Email Security in Extensions > Plesk Email Security > Install Now
4. Remove [email protected] in Domains > example.com > Mail > Email Addresses