I have a basic exchange setup. 1 Front End Server -> 1 Back End Server
We maintain multiple domain name addresses and want to be able to accept email from these addresses. I have added these domain addresses into the Receiptents Policy.
When I point my incoming mail directly to the back end server, the mail goes through just fine for all domains in the receiptent policy. When I point my incoming mail to the front end server, I get an "550 5.7.1 Unable to relay for" error for all but the primary domain.
I did upgrade the back end server several months back, and have been maintaining the old back-end server as a backup system. They are both domain controllers.
On my front end server, under Directory Access it shows as domain controllers the following:
Front End Server, Type = Config
Front End Server, Type = DC
Old Back End Server, Type = GC
It does not list my newer back end server. Don't know if this could cause the issue.
Thanks for your help.