GWIA transfering mail to an outside mail server :
Logs show 450 Host down.
I can ping, and read a lot of posts.
I have tried :
Different DNS server, does not work and should not be neccessary as I can ping outside host.
Shutting down the firewall completely ; does not work
No virus software installed yet.

I have checked, but I have no route.cfg file ( never had )

I also read something about "reverse dns" but do not know what to do with that in GWIA setup.

Any ideas ?