The below steps will walk you through adding HappyFox as a Safe Sender on your Office 365 (Microsoft Exchange) instance. This will help ensure your emails are delivered without any delays.

Connection Filter

Step 1: Log on to your Office365 (Microsoft Exchange) instance, then head on over to the Exchange Admin Center >> Protection >> Connection Filter.

Step 2: On the pop-up window that appears, select "connection filtering". Under "IP Allow list", click the plus symbol (+) to add the HappyFox IP addresses under the Allowed IP Address section - 54.213.101.86, 54.213.101.90, 54.218.238.220, 

54.187.103.206, 54.200.182.110.

Step 3: Click the check box next to "Enable safe list", and then click Save to confirm your settings.