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If there are three users (A, B, C) in an exchange (O365 or recent Exch versions), and there is an incoming email To: A, B, C, where B and C got some delivery failures, will the exchange journal report mention only A? Are there any resources that talk about journaling behaviors in-depth? I searched, couldn't find any..

One more question, can we assume the exchange journal report as source of truth for the message-delivery?

Sathish Kumar
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I have done a test in my lab, if the a message was sent to user01 and user02, and the user02 delivery failed, the exchange journal report mention only user01, the below is the testing screenshots for your reference: enter image description here

And you also receive the NDR for the journal for the failed delivery for user02: enter image description here

For more details on Journaling in Exchange Server for your reference: Journaling in Exchange Server

Joy Zhang
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