Link: http://exchangeserverpro.com/exchange-2010-message-tracking-event-ids-powershell/

 

[PS] C:\>Get-MessageTrackingLog -ResultSize Unlimited | Group-Object -Property:EventId | Sort-Object Count -Desc | Select Name,Count

Name        Count
----        -----
RECEIVE     58679
DELIVER     47496
NOTIFYMAPI  20812
SUBMIT      20806
SEND        19863
RESUBMIT     8679
HAREDIRECT   6826
TRANSFER      351
DSN            96
FAIL           95
SUBMITDEFER     6
BADMAIL         2