Domain validation

[dummy57]

If I have an email address: [e-mail], how do I check with PHP that example.com is a valid domain. I want to do this beyond just making sure the syntax is correct. Isn't there a simple function that does some kind of lookup?

[HalfaBee]

This does what you want

	function verifyemail_validatehost($email, $return_mxhost=0) {
		if (!verifyemail_validateemail($email)) {
			return false;
			exit;
		}

	list($local,$domain) = explode("@",$email,2);

	$mxhosts = array();
	if(!checkdnsrr($domain, "MX") || !getmxrr($domain, $mxhosts)) {
		return false;
		exit;
	}

	if ($return_mxhost) {
		return $mxhosts;
		exit;
	}

	return true;
}