I found this thread that explains what I am trying to accomplish.
https://community.spiceworks.com/topic/668539-office-365-mail-routing-to-a-subdomain
I need some help with configuring the Office 365 connector.
We use Office 365, but we have an internal fax server. I have created the MX record for the fax server. I just want to make sure that I am setting up the anonymous relay (receive connector) correctly.
With my luck, I will disable mail flow entirely.