the problem with that is then that will only remove one event when there are 20+ events that contain that MID.
event1, maildirection=outbound, MID=123
event2, sourceuser=user1, MID=123
event3, destinationuser=user2, MID=123
event1, maildirection=outbound, MID=124
event2, sourceuser=user1, MID=124
event3, destinationuser=user2, MID=124
event1, maildirection=outbound, MID=125
event2, sourceuser=user1, MID=125
event3, destinationuser=user2, MID=125
in that last search each event1 would not be returned, but the rest of the events with MID 123, 124 and 125 would be returned.
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