Mail form movie doesn't communicate with a file other server!

I got the mail form movie from this site that communicates with a .php file in order to send all the info the user has input to an email address.

Everything works fine when both files are in the same server.

The problem is that my client doesn’t allow .php on his server so the best choice is to have the mail form movie on my clients server and the .php file on a server that allows php scripting.

I did practise that and changed the flash file to point to the new address where the .php file lies but with no success.

Is there an issue with flash files not being able to communicate with files on other servers. Is there a solution?

thanx in advance