https://www.machform.com/forums/ MachForm Community Forums Topic: Checking email against DNS MX record en Sat, 20 Jun 2026 18:37:23 +0000 https://www.machform.com/forums/topic/checking-email-against-dns-mx-record#post-10196 Sat, 14 Aug 2010 18:29:25 +0000 yuniar 10196@https://www.machform.com/forums/ <p>Hmm.. have you checked if the function checkdnsrr($domain,'MX') already worked fine on your site?</p> <p>If you are using Windows server, this function only available since PHP 5.3.0 </p> https://www.machform.com/forums/topic/checking-email-against-dns-mx-record#post-10189 Fri, 13 Aug 2010 21:03:47 +0000 vern1271 10189@https://www.machform.com/forums/ <p>No luck... Anyone else ever implement this and get it working? </p> https://www.machform.com/forums/topic/checking-email-against-dns-mx-record#post-10188 Fri, 13 Aug 2010 19:21:35 +0000 yuniar 10188@https://www.machform.com/forums/ <p>Try changing your function to become like this:</p> <pre><code>function domain_exists($value) { $value = $value[0]; list($user,$domain) = split(&#39;@&#39;,$value); if (!checkdnsrr($domain,&#39;MX&#39;)) { return &#39;Sorry, This domain is not valid&#39;; } else { return true; } }</code></pre> <p>` </p> https://www.machform.com/forums/topic/checking-email-against-dns-mx-record#post-10181 Fri, 13 Aug 2010 02:43:00 +0000 vern1271 10181@https://www.machform.com/forums/ <p>I'm trying to add DNS MX validation and I must be missing something, because I can't get it to work...</p> <p>In the common-validator.php file after line 28, I added the following...</p> <p>//validate DNS MX record<br /> function domain_exists($value) {</p> <p> list($user,$domain) = split('@',$value);</p> <p> if (!checkdnsrr($domain,'MX')) {<br /> return 'Sorry, This domain is not valid';<br /> } else {<br /> return true;<br /> } </p> <p> }</p> <p>And in my post-functions.php file I added the following after $rules[$element_name]['email'] = true; on line 296 since I only want to do this on certain forms:</p> <p>if ($form_id == '3') {<br /> $rules[$element_name]['domain_exists'] = true;<br /> }</p> <p>Any help would be appreciated. </p>