MX Lookup Mail Server Domain by Email Address

How to find the mail server for a given email address. Returns the domain name of the primary mail server.

Download Chilkat Email ActiveX

<?php

$mailman = new COM("Chilkat.MailMan2");

//  Any string argument automatically begins the 30-day trial.
$success = $mailman->UnlockComponent('30-day trial');
if ($success != true) {
    print 'Component unlock failed' . "\n";
    exit;
}

//  Should return "mail.chilkatsoft.com"

$mailServerHostname = $mailman->mxLookup('support@chilkatsoft.com');

print $mailServerHostname . "\n";
?>