Microsoft provides resources on how to block a mail sender, and how to manage blocked senders. Please review the appropriate guide below.

For Outlook Desktop Apps for Windows

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

 For Outlook for Mac 

https://support.microsoft.com/en-us/office/block-or-unblock-a-sender-outlook-for-mac-36a1aafc-eb25-46aa-8a3d-0b35c42273c2 

For Outlook Web Access 

https://support.microsoft.com/en-us/office/block-senders-or-unblock-senders-in-outlook-on-the-web-9bf812d4-6995-4d19-901a-76d6e26939b0 

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