Symantec has released a module update for versions 7.5.x & 7.9 of Symantec Mail Security for Microsoft Exchange (SMSMSE) to increase the overall security posture of the product.
To determine if the hotfix has already been applied perform the following:
If the version and build are less than 188.8.131.52 (Build 20180217) the hotfix has not been applied.
Note: If you are running Symantec Mail Security for Microsoft Exchange 7.0.4 or earlier you must upgrade to 7.5 or 7.9 versions prior to implementing.
To apply the Security Hardening Hotfix follow the steps below: