user_email_validation_test.module

<?php


/**
 * @file
 * Dummy module implementing hook_valid_email_address_alter.
 */


/**
 * Implements hook_valid_email_address_alter().
 */
function user_email_validation_test_valid_email_address_alter(&$valid, $mail) {
  $local = '.local';
  // Invalidate all e-mails ending with .local.
  if (substr_compare($mail, $local, -strlen($local)) === 0) {
    $valid = FALSE;
  }
}