Verify email in PHP or other programming language?

How can i make a script like verify-email.org ? I told in the school, that this is not a problem. But now, I searched the web, and found nothing?

E.g. test123@hotmail.com

• I don't want only check if the domain exist of the E-Mail address. I 开发者_C百科want check, the whole E-Mail, if it exists on Hotmail.com?

Thanks.

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You can't. You have to send an email and wait for an answer to verify that this address exists.

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The only clear way to check an email address is valid is to send it an email. If it isn't valid you will get an undelivered response.

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Like my predecessors wrote, you can only completely veryfiy by sending a mail to the address.

However, you could use DNS to check if the domain exists and a MX (Mail Exchange) record is associated with it. It's not a complete solution, but maybe a step that brings you a little further.