You may see any of the following symptoms:
The SMSMSE debug log conduit.log may show the following error message:
NOTE: The debug log is in the following directory:
32-bit Operating System: C:\Program Files\Symantec\SMSMSE\<version>\Server\logs
64-bit Operating System: C:\Program Files (x86)\Symantec\SMSMSE\<version>\Server\logs
8 Dec 2010 16:49:17 (WARNING:6132.1712):  Regexfilter module: read_existing_timestamps(): malformed line in previous timestamp file.
SMSMSE AntiSpam rulesets are corrupt.
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Removing existing AntiSpam rulesets. Then SMSMSE downloads new rulesets.
A. Stop SMSMSE services
B. Clear out existing rules
C. Start SMSMSE services
To start Symantec Mail Security services
Now you should see the new BM_Rulesets, .sequence.0, .sequence.2, blrm, and hashes.
Check and see if the CPU usage has dropped on the Conduit and SMSUtility processes.