How to Add IPs to Office 365 Exchange Online Connection Filtering

Login to Office 365 Exchange Admin Center

Navigate to the Office 365 Exchange Admin Center and login. Note that you need to be an administrator to access this page. Next, click connection filter as shown in Exhibit 1.

Edit Default Connection Filter

Now, ensure Default is highlighted and click the edit icon as shown in Exhibit 2. Note that this will popup the connection filter properties.

Next, click connection filtering on the left-hand side menu in the popup window as shown in Exhibit 2b. Now you’re ready to add IPs to the IP Allow list.

Add Allowed IPs

Ok, now it’s time to add the IPs. Start by clicking the + sign below the IP Allow list as shown in Exhibit 3. Note, this will popup an IP input screen allowing you to enter the allowed IPs. You can only enter one range at a time.

Now, enter the first IP range from the below table and click save as shown in Exhibit 3b. Repeat this step for each additional IP range below.

Great! Now that you’ve entered all IP ranges, click save in the connection filtering window as shown in Exhibit 3c to commit your changes. That’s it! Mail should now be flowing through.