EventSentry keeps going through all of the events of a particular log (e.g. Security) and emailing them over-and-over. How can I resolve this?

This can happen when a monitored event log is corrupt. You can check whether a particular log is corrupt by opening up the Windows Event Viewer and trying to access the event log in question. If there is an error, then event viewer should indicate that.

Clearing the event log in question usually resolves the problem.