Custom URL following form submission with FORMMAIL

Has anyone created a custom URL to redirect your visitors after they fill out an email/contact form on your site that is delivered through FORMMAIL?

If so, have you found a way to have the page include the data that was included in the form?

Right now if I don’t specify a custom URL, the system generates a page that reproduces the form for the visitor. I’d like to do the same thing on my custom URL, but I don’t know how the system is making it happen. I presume the script is feeding the form data in the form of string variables through php for server-side processing of the page.

Can anyone help me with this?

I am More Than You Want Me to Be!