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On the View tab, select View settings.
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Select Mail > Junk email.
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The current list is shown under Blocked senders and domains. You can add a new entry to the list, or you can edit or remove an existing item.
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Go to Outlook > Settings.
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Under Email, select Junk.
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The current list is shown under Blocked Senders and Domains. You can add a new entry to the list, or you can edit or remove an existing item.