I was running some searches agains our messsage tracking logs using the get-messagetrackinglog cmdlet. When I was running get-messagetrackinglog -EventID "SEND" -ResultSize unlimited -Start "03/01/2014 00:00:00 AM" -END "03/27/2014 11:59:00 PM" the command returned no results. When running get-messagetrackinglog -EventID "SUBMIT" -ResultSize unlimited -Start "03/01/2014 00:00:00 AM" -END "03/27/2014 11:59:00 PM" I get plenty of results. Is there a reason why there would be no results for an eventid of send?
We do route all mail through a thirdparty who provides spam filtering and archiving for business continuity.