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If web reputation services is experiencing poor performance, try the following to test your web reputation settings:
Verify that the network connection is stable.
ScanMail monitors its connection status to the Smart Protection Network and the Smart Protection Server providing web reputation services. Enable the alert "Smart Protection Server - Each time Web Reputation service was unavailable/recovered" to receive notifications whenever ScanMail is unable to connect to the web reputation source. If you frequently receive this alert, it is an indication that your network connection is not very stable.
Test the speed of one web reputation query
You can check the web reputation performance log to monitor the speed of the web reputation queries. Add the line wtp_performance:1 to the registry key DebugModule. The registry key path is as follows:
HKEY_LOCAL_MACHINE\SOFTWARE\TrendMicro\ScanMail for Exchange\CurrentVersion
ScanMail will then generate the file wtp_performance.log in the ScanMail debug folder located in <ScanMail install path>\Debug. The default debug folder path is as follows:
C:\Program Files\Trend Micro\Smex\Debug
This log will list the time it took to query each URL (in milliseconds).
You do not need to enable the ScanMail debug log to perform this check.