Block a mail sender - Microsoft Support
https://support.microsoft.com/en-us/office/block-a-mail-sender-b29fd867-cac9-40d8-aed1-659e06a706e4
WEBBlock a 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 ...
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