PLEASE HELP - Users can SEND, but not RECEIVE...?!

[Zoplax]

I have a BellSouth DSL router which has a static IP assigned.

Behind that router, I have a D-Link router, with one of the static IPs for the site.

The BellSouth router has no firewall enabled, but the D-Link has the static IP on its WAN side, and is doing NAT on the LAN side with range in 10.1.1.x subnet.

Users can send mail from the site's Exchange 2003 server fine, and outgoing mail reports the correct IP address of the D-Link router.

The D-Link router is set up with port-forwarding to forward all SMTP (TCP port 25) to the server's internal IP address. Also, Internet DNS has the correct IP addresses defined for the MX record, and the A record points to the correct IP address for the D-Link.

I can ping the BellSouth router, but cannot ping the D-Link router. BellSouth router is NOT doing any NAT, so I'm just assuming that the D-Link is on and will forward the appropriate traffic to the internal LAN.

Do I need to set up a static route between the BellSouth and the D-Link...?! I'm confused.

Please help! Thank you.

 

[Zoplax]

One note, the AD domain name for the server differs from the DNS name of the site in terms of the Internet. But, I have the Exchange SMTP connector set up to receive mail for the Internet domain names.

Do I need to set up DNS with information about these other domains...?!