Running Exchange 2007 and have a voice mail system using a different domain name. The VM system is not part of our AD in any way. I need to be able to relay SMTP messages to vtext.com for text notification through Exchange.
I've added the domain for the VM system as an accepted domain (External Relay) and have created a send connector with the appropriate rights (works for other relaying). The only difference seems to be that the other application servers send as an address using the authoritative domin.