DNS inconsistency when switching from corporate to external network

I have a problem I've been tracking for months, and just can't seem to figure out.
I'm trying to access my corporate website, www.company.com (for instance). From inside of my corporate network, this resolves to an internal IP address, and works fine.
From outside of my corporate network on my 10.5 MacOS, I cannot reach the site in Safari, getting a "cannot reach the server" message. If I lookup the IP address using a command line "host" query, and put that address in Safari, I can reach it. If I add that IP address to the /etc/hosts file, I can also reach it. But Safari doesn't seem to want to resolve the address on its own.
This extends to Mail.app, which also cannot connect to my mailserver unless I add it to the /etc/hosts file.
A windows machine at home, on the same network as I'm on, can reach www.company.com without any of the DNS trickery.
Best I can tell, for some reason MacOS alone cannot resolve the IP addresses of this domain, and only this domain, except when inside of my company network (in which case it is an internal address).
One weird oddity, is that if I connect up to the Internet with my Sprint mobile broadband card, everything works again.
I've tried clearing the DNS cache with "dscacheutil -flushcache" to no avail.
So on my airport interface only, from my home network from which a Windows machine does just fine, my Mac cannot resolve the IP address automatically of my corporate external network (basic "www" site) which resolves differently when I'm on the corporate network. The "host" command consistently works though, and manual insertion of the IP address works.
I'm not using any kind of VPN.
Any ideas?

Also, and to clarify, I have changed DNS servers to a variety of public ones, as well as one I run, as well, to no avail. Same behavior.
I suspect that the Apple apps are still trying to resolve to my corporate (192.168.xx) address, despite the fact that I'm on an external network, and I can't for the life of me figure out why. (At least that is my guess.) Again, no VPN in place at all.

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From: [email protected]
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