I'm currently in the process of migrating to Office 365. I'm running Exchange 2010 on premise, I have my hybrid environment set up and I have migrated nearly half of our mailboxes up to O365. I am running in to a problem now though. I am running a fax server on premise that I will be keeping once the move to O365 is complete and it has the ability to send faxes via e-mail. If an e-mail address ends in faxfinder.mydomain.com, it is passed to the fax server for processing. I am having trouble finding a way to route all mail destined for the faxfinder.mydomain.com subdomain from O365 to my on premise fax server. I have created the subdomain in O365, and created the MX and other DNS records for it. I have NAT'd my fax server and opened the necessary ports to it on my firewall. I'm not sure what else needs to be done. Has anyone out there...
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