rendered paste body<?php function valid_email($email) { if (preg_match ("/^[\w\.-]{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]+$/", $email)) { list($prefix, $domain) = explode("@", $email); if (($socket = fsockopen($domain, 25, $errno, $errstr, 5))) { fwrite($socket, "HELO " . $domain); fwrite($socket, "MAIL FROM: <kingskrown@yahoo.com>"); fwrite($socket, "RCPT TO: <" . $email . ">"); $reply = fgets($socket); fclose($socket); } else { return -1; } } else { return -1; } $code = intval(substr($reply, 0, 3)); return $code; }?>