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in the section
Exchange mail flow rules (also known as transport rules): When Mail flow rule blocks, if the message is spam or hspm or phish still filter wins and not organization

Tested and confirmed on several tenant

Also see EOP filtering stack
https://learn.microsoft.com/en-us/defender-office-365/protection-stack-microsoft-defender-for-office365#phase-3---content-filtering

ETR set scl before our filtering content
https://learn.microsoft.com/en-us/defender-office-365/protection-stack-microsoft-defender-for-office365#phase-3---content-filtering
image

if ETR set scl to 5 or 6 it will be overriden by SCL of our Machine learning

in the section
Exchange mail flow rules (also known as transport rules):
When Mail flow rule blocks, if the message is spam or hspm or phish  still filter wins and not organization

Tested and confirmed on several tenant

Also see EOP filtering stack
https://learn.microsoft.com/en-us/defender-office-365/protection-stack-microsoft-defender-for-office365#phase-3---content-filtering

ETR set scl before our filtering content
https://learn.microsoft.com/en-us/defender-office-365/protection-stack-microsoft-defender-for-office365#phase-3---content-filtering 

if ETR set scl to 5 or 6 it will be overriden by SCL of our Machine learning
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Learn Build status updates of commit 33b4c04:

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defender-office-365/how-policies-and-protections-are-combined.md ✅Succeeded

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Learn Build status updates of commit 3e3c531:

✅ Validation status: passed

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defender-office-365/how-policies-and-protections-are-combined.md ✅Succeeded

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Learn Build status updates of commit ba341c3:

✅ Validation status: passed

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defender-office-365/how-policies-and-protections-are-combined.md ✅Succeeded

For more details, please refer to the build report.

@chrisda chrisda merged commit a809464 into MicrosoftDocs:public Sep 12, 2025
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