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    <p><a href="https://stackoverflow.com/questions/3024819/how-do-i-check-if-an-email-address-is-valid-without-sending-anything-to-it/3024903#3024903">bucabay's</a> answer is the way forward. What a library like that essentially does is checking for existing DNS record for (mail) servers at specified domains (A, MX, or AAAA). After that, it do what's termed callback verification. That's where you connect to the mail server, tell it you want to send to a particular email address and see if they say OK.</p> <p>For callback verification, you should note greylisting servers say OK to everything so there is no 100% guarantee possible without actually sending the emails out. Here's some code I used when I did this manually. It's a patch onto the email address parser from <a href="http://code.iamcal.com/php/rfc822/" rel="nofollow noreferrer">here</a>.</p> <pre><code> # # Email callback verification # Based on http://uk2.php.net/manual/en/function.getmxrr.php # if (strlen($bits['domain-literal'])){ $records = array($bits['domain-literal']); }elseif (!getmxrr($bits['domain'], $mx_records, $mx_weight)){ $records = array($bits['domain']); }else{ $mxs = array(); for ($i = 0; $i &lt; count($mx_records); $i++){ $mxs[$mx_records[$i]] = $mx_weight[$i]; } asort($mxs); $records = array_keys($mxs); } $user_okay = false; for ($j = 0; $j &lt; count($records) &amp;&amp; !$user_okay; $j++){ $fp = @fsockopen($records[$j], 25, $errno, $errstr, 2); if($fp){ $ms_resp = ""; $ms_resp .= send_command($fp, "HELO ******.com"); $ms_resp .= send_command($fp, "MAIL FROM:&lt;&gt;"); $rcpt_text = send_command($fp, "RCPT TO:&lt;" . $email . "&gt;"); $ms_resp .= $rcpt_text; $ms_code = intval(substr($rcpt_text, 0, 3)); if ($ms_code == 250 || $ms_code == 451){ // Accept all user account on greylisting server $user_okay = true; } $ms_resp .= send_command($fp, "QUIT"); fclose($fp); } } return $user_okay ? 1 : 0; </code></pre>
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    1. COWatch out for doing callback verification / sender address verification. There is debate over it's usefulness ( see http://en.wikipedia.org/wiki/Callback_verification references for example) and some RBL's will include you _just_ for doing sender address verifications.
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