Freelancer: mosiddiqui
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Here is how it works..

It simply connects to the given mail server i.e domain name there, simulating a email to be sent, and testing if the server answer with some error like email not found or Ok. Email exists or not depends on the response.

Inscrição nº 3 do Concurso para Verify email addresses - Tell me how this website works - Best answer wins!
Inscrição nº3

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