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Follow these steps:

  1. Go to Inbound Protection > Content Filtering > Click Add to create a new policy.
  2. Under Basic Information, enter the name of the policy.

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  3. Under Recipients and Senders > Recipients, choose Specify then enter the user's email address. Click Add.

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  4. Under Scanning Criteria > Advanced, check Envelope sender is blank.

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  5. On the Actions Tab > Intercept > Quarantine, click Submit.

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