Question : Need help setting up IP routing to SBS 2003 with Public LAN/WAN

Experts-
I received static IP addresses from AT&T.  They gave me two sets, a public WAN and a public LAN (these are obviously not the real IPs):
WAN
IPs: 89.123.11.142/143
Subnet Mask: 255.255.255.252
Gateway: 89.123.11.141
LAN
Useable IPs: 79.123.22.241/245
Subnet Mask: 255.255.255.248
Gateway: 79.123.22.246

The office consists of a DSL modem ->Linksys WRT54G router -> SBS 2003 server ->workstations
Additionally, the SBS 2003 server is a mail server with an MX record and linked to a LAN IP.  I need to be able to see the server from the Internet (ping it, send mail, remote access, etc).  SBS has a dual NIC and from what I understand is supposed to be setup with one internal NAT network and one external ISP network.

Diagram below is how I have it setup now.
 
My problem is that I cannot see the server from the Internet.  I need the Linksys router for office wireless connectivity (printers, notebooks, etc).  AT&T will not allow the LAN IPs to be on their network and they control routing from the 89.x subnet to resolve to 79.x.  I can ping both 89.x IP addresses as well as the Linksys LAN side (79.123.22.246).  But, even putting the SBS server IP (79.123.22.245) in the DMZ does not allow me to see it from the Internet.  Port forwarding also doesnt work.  Am I missing something?

Thanks,
-Joe

Answer : Need help setting up IP routing to SBS 2003 with Public LAN/WAN

If you need the Linksys router for office printers, etc., why don't you have it on the LAN side of your SBS?  This should take care of your problems.

If you need to keep the Linksys at it's place in the chain for some reason, then I would think that static routing might need to be configured on the device.