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How to Configure Office 365 to Block Inbound Email Not Originating from Barracuda Email Security Service IP Address Range

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You can configure Microsoft Office 365 to block any inbound email that does not originate from the Barracuda Email Security Service network.

Office 365 IP addresses and user interfaces can change; refer to Microsoft documentation for configuration details.

See Barracuda Email Security Service IP Ranges for a list of IP rages based on your Barracuda Email Security Service instance.

To restrict access to the Barracuda Email Security Service IP address range for Office 365 based on your Barracuda Email Security Service instance, follow the instructions described in Step 4. Restrict Inbound Mail to the Barracuda Email Security Service IP Range of How to Configure Office 365 for Inbound and Outbound Mail.  O365

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