I have a user that is under our Primary Domain ABC.com
This user however has an Email address under a different domain that is apart of our Exchange server and its called DEF.com. This user is able to send and receive emails just fine.
However just recently this user tried to send an email from DEF.com to XYZ.com and they never receive it, however if I send XYZ.com an email from ABC.com they do receive it.
When I go into the message tracking system and track messages sent from that user under DEF.com to XYZ.com it comes up blank.
But if I do message tracking from ABC.com it shows it was routed correctly to XYZ.com
So how can I track where DEF.com is ending up, its like it goes out and just disappears.