Please look at the article here on how to set up mail forwarding for an exchange mailbox,to forward to an external ID.
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 Cente…