in reply to
Re^2: verify form submission is from a specific place
in thread verify form submission is from a specific place
I don't really see much of a way solution, considering your current level of resources. As a very last possible resort you could have the DMZ server email the requests to an account on the Intranet server for processing (which is a whole different security concern), then the intranet server could post the results to a form on the DMZ server. This would REALLY slow the process down, but I believe it to be at least an option if there are not any others.