https://www.youtube.com/watch?v=Gv1RviVLZHw&feature=player_embedded
Exchange 2010 loggs files in different places… and i do seem to forget where…
So just a heads up anda areminder how to do this things…
Receive connector protocol log filesC:\ProgramFiles\Microsoft\ExchangeServer\V14\TransportRoles\Logs\ProtocolLog\SmtpReceive
Send connector protocol log filesC:\ProgramFiles\Microsoft\ExchangeServer\V14TransportRoles\Logs\ProtocolLog\SmtpSend
A good post here on the subject https://technet.microsoft.com/en-us/library/dd302434.aspx