Verify that a user's email exists in provided domain using PHP [duplicate]

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Possible Duplicate:
check if email are valid and exists
How to validate an email address in PHP

I am developing a application for sending mail by provided mail address in PHP. now i wanna validate given mail address is really exist in domain or not

  **i.e
    abc@xyz.com (for example its registred in xyz domain)
    abcd@xyz.com (for example its nod registred xyz domain)**

how can i verify it by using PHP.

Thanks in advance

Answer 1

1. Generate a token
2. Store that token against the email address in a database
3. Send an email to that address with a URL that includes the token and a hash of the email address

If someone visits that URL, then the address exists.

SMTP provides a mechanism to ask if a server hosts a particular address, but it is almost always disabled as it is a favourite tool of spammers.