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Mark email as junk in Webmail
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Select the message you want to mark as junk.
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At the top of the screen, select Junk > Junk to report that individual message as junk and move it to your Junk folder.
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If you want to completely block all messages from that sender, select Junk > Block (Sender)
Mark email as junk in the Outlook desktop client
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Select the message you want to mark as junk.
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Right click the message, then select Junk > Block Sender