Postfix relaying mail to internal mail server
I have an Exchange server running inside our network, exchange.mydomain.local at 192.168.168.3 I am trying to set up Postfix to accept mail bound for mydomain.com and relay / forward it to the exchange server. It will accept mydomain.com email but it tries to deliver it locally.
I added "mydomain.com smtp:[192.168.168.3]" to /etc/postfix/transport and ran postmap transport. I cant seem to figure out what changes to main.cf I need to stop mydomain.com mail from being delivered locally on the Postfix box.