Navigate to Microsoft 365 Admin -> Exchange -> Mail Flow -> Rules:
- Add a rule
- Name: Block MS Quarantine
- Apply this rule if "The Sender" "is this person"
- Do the following "Block the message" "delete the message without notifiying anyone"
- Click Next
- Click Next
- Click Finish and let it save.
- Now, re open the newly created rule and turn it on!
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