Office 365 / Exchange Online Block Sender Domain
General, Office 365
The procedure is the same whether you use the Classic Exchange admin center or the new Exchange admin center.
Go to Mail flow – Rules – Create a new rule

Give the new rule a name and click on More options …

Click on Apply this rule if … and select The sender … and domain is

Add the domain you want to block.

Click on Do the following … and select Block the message … – delete the message without notifiying anyone or one of the other two options regarding your needs.



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