====== DNSEmailRule ======

Input validation rule that tests for a valid email address (see [[EmailRule]]) and verifies that the domain portion of an email address has a valid DNS "MX" record.

===== Example =====

<code php>
$form->addRule (new DNSEmailRule ('fieldName'));
</code>

This example will check that the field named "fieldName" contains an email address that has a proper DNS-verified domain name.

===== Additional Information =====

  * [[EmailRule]]
  * [[wact:api:validation:rule:catalog|Validation Rules]]
  * WACT [[wact:Form Validation]]