We are in the process of migrating from Exchange 2003 to Exchange 2007. The current network setup is as follows
[Internet] ---email flow->[Gateway Mail Marshal Server in DMZ] --[<- Firewall Policies ->]--->[LAN: Exchange 2003 / Exchange 2007].
All policies from DMZ -> LAN and LAN ->DMZ are in place on the firewall. I have opened the policies for testing purposes. I am able to ping / RDP between the DMZ and Exchange 2007 in both directions.
However, I canno use telnet from Gateway(DMZ) to Exchange 2007. It simply does not work.
I am able to telnet into Exchange 2003 just fine.
I have modified the "Default Reciever" in Exchange 07 to include the DMZ Gateway's IP Address.
Still no go -
Any help would be great! Final Idea is to route the emails from Gateway to Exchange 07 instead of Exchange 03. Currently there is a routing group in place between the two exchange servers to route the emails internally. All mailboxes have been moved to the Exchange 07 already.
This is the last step before i delete the routing groups and proceed with the decommissioning of the Exchange 03.