any sort of contact form will do that for you, it doesnt have to be php. the goal is simply to just not post the email address on the web.
depending on what you want to do, other languages may be better choices. for instance there is a cpan library (i forget the name right now) that will not only verify that the email address someone enters into your form is in valid form but will contact the users server and make sure the account exists.
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# chmod 111 /bin/Laden
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