Run a message trace and view the results in the Exchange admin …
https://learn.microsoft.com/en-us/exchange/monitoring/trace-an-email-message/run-a-message-trace-and-view-results
After you run a message trace in the EAC, the results will be listed, sorted by date, with the most recent message appearing first. You can sort on any of the listed … See more 1. In the EAC, go to Mail flow > message trace. 1. To find and open the classic EAC, see Exchange admin center in Exchange Online.
1. In the EAC, go to Mail flow > message trace.
1. To find and open the classic EAC, see Exchange admin center in Exchange Online.
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