Blocking someone will stop their email from coming to your Inbox.
Block someone in Outlook.com
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To block someone in Outlook.com, select the messages or senders you want to block.
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From the top toolbar, select Junk > Block (or Spam > Block).
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Select OK. The messages you select will be deleted and all future messages will be blocked from your mailbox.
Notes:
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To unblock someone, open your Blocked senders list and select the
next to their name.
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If you're still receiving email in your Inbox from a sender you blocked, see Receiving email from blocked senders in Outlook.com.
Mark email as junk or spam in Outlook.com
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Select the messages you want to mark as junk.
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At the top of the screen, select Junk > Junk (or Spam > Spam) to move the message to your Junk or Spam folder.
Notes:
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If email is being sent to your Junk folder in error, read Mail goes to the Junk folder by mistake.
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Messages in your Junk folder are automatically deleted between 10 and 30 days after they arrive.