Premium Antispam is enabled and configured, but no spam is detected.
When a DebugView log is obtained for transport scanning per How to Obtain Debug Logs for Symantec Mail Security for Microsoft Exchange (SMSMSE), section C, To enable logging for transport scanning issues on Exchange 2007, 2010 and 2013 (including AntiSpam issues), lines similar to the following are observed:
SMSUtilityService( ..\..\..\src\Server\SAVFMSESpamStatsManager\PremiumAntiSpamScanner.cpp(85) CPremiumAntiSpamScanner::GetSPALicenseStatus -> SPA License validation error.
SMSUtilityService ( ..\..\..\src\Server\SAVFMSESpamStatsManager\PremiumAntiSpamScanner.cpp(86) Debug Trace: HRESULT=0x80040154 - Class not registered
The licensing module for SMSMSE was not registered properly during installation.
Spam should now be filtered as expected.