Although you seem to have found a solution, you should note that if you have other options available (e.g. perl, python, etc.) that you can run from a cgi-bin, there are lots of free mail scripts available that don't depend on php.
It's also important to remember that unless you're using SSL for your form, any information the user submits to you is unencrypted between their computer and your web server. Additionally, if you're doing something simple like emailing the results like this, the information will be unencrypted between your server and emailmeform.com (not to mention the loss of privacy by going through a third party server), and then emailmeform.com and your email server, and then possibly also your email server and your computer (if you're not using SSL for checking your email).
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