From Settings:
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At the top of the page, select the gear icon
to open settings and then select View all Outlook settings.
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2. Select Mail > Junk email.
3. Under Blocked senders and domains, select Add.
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4. Type the email address of domain that you want to block and press Enter.
5. Select Save.
**To unblock a sender, select the trash icon next to the email address or domain you want to unblock.