Export Exchange Online sent e-mail message from SMTP transfer agent queue

Question

Is it possible to export an e-mail message sent by an user from Exchange Online SMTP agent queue? I need the complete message with full headers. I am able to extract it from user mailbox but I don't get SMTP headers. The message has been externally delivered to another domain but I need to legally demonstrate that it has been modified after sending it. Another way could be a simple checksum/hash in Exchange logs but I didn't find anything like that. Thanks Marco

Answer 1

Hi @ Marco Pozzi，

As far as I know, under normal circumstances, we do not have permission to obtain or download SMTP server logs through the Exchange admin center or the M365 admin center.

I recommend that you could open a support ticket to contact a back-end engineer for more detailed assistance:

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Answer 2

Hi @ Marco Pozzi，

The message headers of the emails can only be viewed from the recipient's inbox, and we can't get the details from our own Exchange Online.

In my research and testing, in Exchange Online, we can only go through message trace to see if the email applied to a transport rule and modified the headers internally.

Thank you for your understanding and patience！

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