Software

Okie well I am pulling my hair out I am not sure what this issue is exactly but I suspect DNS issues. I am running windows server 2003 enterprise and exchange 2003 all updated and clean versions. Installs went perfect. Configuration (which I know very little about ) seems to have worked.
Heres the general layout of the network :
internal network is internal.local with 3 DNS serves and 2 ADC, 2 GCS. now I setup 2 servers gizmo.internal.local and sith.internal.local. gizmo is the frontend exchange server and the webserver. Sith is the backend and does nothing else. now I setup gizmo the frontend with another zone for external.com with reverse records pointing to my external IP. I also made records for ns1.external.com and ns2 which in reality are the same server for now. Well internally exchange works but in outlook when creating the profile it changes mail.external.com to sith.internal.local. BUT it works. OWA works as well. Now externally when I input mail.external.com and my name it resolves and underlines *but* it changes the mail.external.com to sith.internal.local which as I am sure you can figure out doesnt work! Ummm so the main questions are these:
How do I fix the DNS to not resolve mail.external.com to mail.internal.local
and 2) Why is it resolving to the BACKEND server sith when gizmo is the frontend?
Thanx in advance for any advice!