I have installed an email newsletter script but unfortunately didn't supplied a sign up script.
In the instructions it says:
This newsletter is working as an API, it can be easily connected with your existing order form or any software you use to manage your orders online.
(simple call, like:
[code]<?php file_get_contents('http://www.yourdomain.com/AutoResponder/api.php?name=Johnemail@example.com'); ?>[CODE]
I after a form that i can pasted into wordpress widget that will do the above call.