<?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;
	}
?>