PHP Email Validator – Email MX DNS Record Check

/ Published in: PHP
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Validating an email address is one of the hardest feats on the web. A valid email can be marketing
gold, but an invalid email address is dead weight. Not only does it require a CPU-taxing PHP regular
expression ("/^[A-z0-9\._-]+"."@" . "[A-z0-9][A-z0-9-]*". "(\.[A-z0-9_-]+)*"."\.([A-z]{2,6})$/"),
the regular expression can be useless even after it's validated for format if the domain doesn't

A regular expression simply wont do -- we need to think more low-level. What does email at any
domain require? A DNS MX record. Well, PHP provides a great solution to validate that there's a MX
record for the provided email address' domain.

Copy this code and paste it in your HTML
  1. <?php
  2. function domain_exists($email, $record = 'MX'){
  3. list($user, $domain) = explode('@', $email);
  4. return checkdnsrr($domain, $record);
  5. }
  6. if(domain_exists('[email protected]')) {
  7. echo('This MX records exists; I will accept this email as valid.');
  8. }
  9. else {
  10. echo('No MX record exists; Invalid email.');
  11. }


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