"The origin of the file should not be visible to the user."
Such is readily apparent as the file download gets underway.
-> But what you ask could be accomplished by your programming staff in a few days. Just ask them to code it up.
I am am looking for a server based application (Unix/Linux/PHP) that will allow users to download a file after entering an email address, then subscribe to a newsletter by ticking a check-box. The addresses should then be captured into a mailing list, or at least presented in such a way that they could be imported/exported/copied & pasted to a mailing list or MySQL database. The origin of the file should not be visible to the user.
Does anyone know of any open-source, free or cheap software that would do this?. Preferably not a shopping cart.