Message Trace not found

Question

Hi there,

is there a way to find message trace log for a address that not has a Mailbox behind?

I explain better.
We have a noreply@keyman .com address, a lot of customers they are wrong and write here.
If I check in the message trace to find all logs I see only trace when the sender is in the domain, not external address.

how can i accomplish this necessity?

thanks so much

Answer 1

Depends. By default, if your domain is configured as authoritative in Exchange Online, any messages sent to non-existent addresses will be blocked by the DBEB feature. As this happens before the message reaches the transport pipeline, there is no record of it in message trace. Read more about DBEB here: https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/use-directory-based-edge-blocking
If you want to monitor such messages, best create a shared mailbox for the noreply@keyman .com address, or any other type of recipient.

Answer 2

thanks a lot, so you don't advise to disable DBEB but create a mailbox behind..