Customer seeking to see that a response rule for a policy did send an email notification.
The default logging level does not include indication of messages sent for response rules, or other email messages sent from enforce. To view message notifications to response rules within the enforce logs, the logging level must be at DEBUG or greater logging level.
Increase the VontuManager logging to DEBUG.
If you require this information, contact support. Increasing logging at this level will very quickly add to log volume stored, and should be done with caution and only for a short period.