Checking for a valid and in-use email address in PHP

Posted by espais on Stack Overflow See other posts from Stack Overflow or by espais
Published on 2010-03-25T09:59:02Z Indexed on 2010/03/25 10:03 UTC
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php

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sendmail

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email-verification

I'm not sure if this is exactly possible, but figured I'd throw it out there.

I have a client that is getting some hate-mail from somebody he knows via a contact form on a website that I developed for him. Currently I do the normal checks for a validly-formatted email address, along with a Captcha, but the client has requested that a user enter his/her own email address in the form.

Now I realize that something like this could be easily spoofed by setting up a fake Yahoo account, etc, but the client's thinking is that this person is not quite that computer-literate.

Is there any possibility for checking if an email address is valid and in-use? The only other things I can think of is turning his contact form into a mailto: link.

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