Hi,@Tom1156
Thanks for posting your question in the Microsoft Q&A forum.
According to your description, when you send an email to DG is that the message trace does not show DG's name.
I performed the relevant tests.
1.Send an email to a DG.
2.Use Messsage Trace to search this mail. There is no problem as you describe.
Have you tried re-searching? Can you provide a screenshot of the Message trace results?
If my answer is helpful to you, please mark it as the answer so that other users can refer to it. Thank you for your support and understanding.