Barracuda Email Security Service, using Office 365.
- Login to the Office 365 website. Click on Admin, then Exchange.
- From the Exchange Admin Center (EAC) click on Protection ->Connection Filtering and you will be able to add the IP ranges.
- 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.
See the following page for more information on configuring this in O365:
Link To This Page: