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On the left sidebar, go to the Settings > Sender Policy page, and enter the email address or domain in the Sender field.
From the Policy drop-down menu, select whether to Block, Exempt, or Quarantine the sender.
Optionally, you can add a comment to indicate why you created the policy.
Click Add to save the policy:
To remove a policy, click Remove in the Actions column for the sender policy you want to remove.
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