Hi,
Thanks for posting your question in the Microsoft Q&A forum.
Based on your description, I conducted relevant tests.
- This is my new rule.
- This rule works as expected. The exemption is working.
I have a few questions to confirm:
- Based on your message tracking screenshot, can you give a complete screenshot due to lack of information?
- Have there been any NDRs? If yes, please provide the complete NDR.
- I compared the rules I created with yours, and on the surface there is no difference. Have you created other rules?
- You can use the Get-MessageTrace cmdlet to query the specific reason why the email was dropped. Please provide a screenshot.