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Office 365 (Outlook 2016 | Outlook 2013) - Block a mail sender
When you no longer want to see messages from someone, you can block a sender.
- Right-click a message from the sender you want to block, and then click Junk > Block Sender.
The blocked person can still send you mail, but if anything from his or her email address makes it to your email account, it's immediately moved to the Junk Email folder.
It's a good idea to periodically review email messages identified as junk to make sure you're not missing important messages.
I changed my mind.
If you later decide you want to unblock a sender, use Junk Email filters to change which messages you see.
For more information, please visit the Office Help & Training site.