I have an Exchange 2013 server that is already setup and running just fine. I'm trying to hook up a USB fax machine to it and route faxes through the Exchange server itself. I have the faxes working, but it's failing when routing to Exchange.
It has an internal relay connector that's setup, in addition to the standard external connector, that accepts emails from our network copiers. The standard connector accepts TLS, Basic, Integrated, and Exchange authentication and from Exchange servers, Legacy Exchange servers, and Exchange users. The internal relay connector accepts only Externally secured authentication from Exchange servers and Anonymous users.
I've tried setting the Fax authentication to basic and integrated with the admin account and also my own account and the routing keeps failing. Do I need to add the Exchange server's IP to it's own list of accepted SMTP servers somewhere? That seems redundant to me since it's basically trying to email itself, but I'm out of ideas.