I am trying to finish a sbs 2003 to sbs 2008 migration and have run into an issue. I cannot get external inbound mail to work. Outbound mail is working and as long as I have the 2003 box up and running inbound mail works. But when I disconnect the 2003 box from the network inbound mail stops. I can telnet to both boxes from inside the network on port 25. The 2003 box responds with the external domain name (domain.com) and the 2008 box responds with its local FQDN (server.domain.local). The 2003 box will respond to telnet on the outside network. The firewall is set to NAT the external address to either internal server. I don't know how to make 2008 except the inbound mail.
Thanks in advance