Internal Mail won’t resolve to emailserver domain, but LAN ip works

Internal Mail won't resolve to emailserver domain, but LAN ip works Hey gang, longtime reader first time poster. After wrestling with this issue, i'm about out of ideas. Here's my setup. Leopard server 10.5.4, running OD master (all rocking), AFP, Firewall, DNS, (mobile) network home directories. I'll call this "xserve.mydomain.com " Its NAT'd IP is 192.168.1.102. It's a FQDN, kerberos is running and happy, all is well. There are about 12 clients, each with a desktop (imac) and laptop (macbook). I have a second (windows 2003 sbe) server hosting the following services: Exchange and Web (for now). I'll call this winsbe.mydomain.com Its NAT'd IP is 192.168.1.101 My External DNS setup is this. Our DNS hosting is done by our registrar (network solutions). We own 4 static IPs from our ISP. One IP is for our router/firewall providing NAT to internal clients, and the xserve is on DMZ, with its OSX firewall service turned on. One IP is for the windows server. (the last two, if you've been counting, are unused :). Via Network Solutions "advanced DNS", I have our zone configured. "xserve.mydomain.com" points to its WAN IP (66.xxx.xxx.198). www points to 66.xxx.xxx.194. MX records refer to "winsbe.mydomain.com" via WAN IP 66.xxx.xxx.194 as well. All outside services resolve correctly. IE, i can hit the website and send/receive email from mydomain.com. My internal DNS as setup as this: primary zone= mydomain.com nameserver= xserve.mydomain.com mx record= winsbe.mydomain.com xserve.mydomain.com has an A record to LAN IP. winsbe.mydomain.com has an A record to LAN IP. www is a CNAME record to winsbe.mydomain.com.