How to Block a Domain to Microsoft Office 365

Created by Abhishek Devrani, Modified on Fri, 23 Oct, 2020 at 12:27 PM by Abhishek Devrani

1. In the Admin center, open the Exchange Admin Center

2. Select Protection then select a Spam filter

3. Select the Default rule (or the desired rule, if using more than one) and click the pencil icon or double click to open the dialog

4. Click the plus sign to add email addresses or domains to the Block Lists