How do I check if an email address is valid without sending anything to it?

Posted by Charles on Stack Overflow See other posts from Stack Overflow or by Charles
Published on 2010-06-11T17:22:05Z Indexed on 2010/06/11 17:32 UTC
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I have a client with 5000 emails from an old list he has that he wants to promote his services to. He wants to know which emails on the list are still valid. I want to check them for him - without sending out 5K emails randomly and then being listed as a spammer or something. Ideas?

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