SYMPTOMS
Spam assassin server-wide settings configuration fails with the following error:Error: Cannot exec 'spammng --update-event-settings --mailname':
Key cannot be null.
Parameter name: key
RESOLUTION
Please download the following file:http://download1.swsoft.com/Plesk/Autoupdate/Windows/8.2.0/123392/spammng.exe
and place it to %plesk_bin% folder.