68bb4124_xchange_2010_and_Exchange_2007__EventID
[Description] Delivery failed. The RecipientStatus field has more information about the failure, including the SMTP response code. You should also look at the Source and Recipients fields when inspecting messages with this event. [EventID] 
FAIL
Exchangepedia | Message Tracking from the command line in Exchange 2010 and Exchange 2007
EventID