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IMSS reprocesses notification email messages for security reasons. Therefore, if a notification email message was quarantined due to a policy violation, the notification email message generated by IMSS would not have a message ID.
If you do not want IMSS to scan the notification email messages, you can disable notification email message scanning:
  1. Modify the following setting in the [general-notification] section of the imss.ini:
    NotificationSkipScan=1
  2. Restart the IMSS daemon by typing the following commands:
    net stop TmImssScan
    net start TmImssScan
  3. Restart the IMSS Scan Service as follows:
    • Go to Control Panel → Administrative Tools → Services.
    • Right click on Trend Micro IMSS Scan Service and choose Restart.
    Note
    Note
    Trend Micro recommends against disabling the scanning for notification email messages.