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For classic Outlook, in the message, list, select a message whose sender you want to block.Â
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On the Home of the ribbon, in the Delete section, selectÂ
(If you don't see Block, at the right end of the toolbar, select  More commands, then select Block > Block Sender.)
Tip: You can block or unblock a sender anytime. Select Block> Junk E-mail Options. Choose the Safe Senders or Blocked Senders tab and make your changes. For more info, see Unblock a sender.
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For new Outlook, select a message whose sender you want to block.Â
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On the Home tab, select Block > Block Sender.
If you don't see Block, go to the right end of the toolbar, select  More options, then select Block.
Tip: You can block or unblock a sender anytime. Select View > View Settings > Mail > Junk email. Make your changes under Safe senders and domains or Blocked senders and domains. For more info, see Unblock a sender.
