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Barracuda Email Security Service

How Can I Add the Barracuda Email Security Service IP Ranges to O365?

  • Type: Knowledgebase
  • Date changed: one month ago
Solution #00007104

Barracuda Email Security Service, using Office 365.

  1. Login to the Office 365 website. Click on Admin, then Exchange.
  2. From the Exchange Admin Center (EAC) click on Protection ->Connection Filtering and you will be able to add the IP ranges.
  3. Click on the + sign to add an IP or range in allow or block IP address. If you will type an invalid IP or subnet, then you will get an error.

Note: The required IP ranges for ESS are

Some Customers have reported that you can only add /24 ranges to the O365 setup as well as to some on-prem mail servers.
Below is our IP ranges broken down into /24 ranges. Each range will need to be added.

Additional Information:

See the following page for more information on configuring this in O365:


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