jQuery Validator Email Domain

demo.html

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/jquery.validation/1.16.0/jquery.validate.min.js"></script>
<script src="https://cdn.jsdelivr.net/jquery.validation/1.16.0/additional-methods.min.js"></script>

<form id="myForm" name="myForm" action="#" method="POST">                                                                                                                                                                                                                     <style>#email-error { display: block; color: red; }</style>
  <label for="email">Email: </label>
  <input id="email" name="email" type="email" minlength="6"/><br>
  <input type="submit" value="Submit">
</form>

jquery.valid.method.js

// Banning domains
var bannedDomains = ["spam.com", "junk.com"];

$.validator.addMethod('domainNotBanned', function(value, elem, param) {
  var domain = value.split('@')[1];
  return bannedDomains.indexOf(domain) < 0;
}, 'Emails from this domain are not allowed.');

// Banning specific addresses
var bannedEmails = ["[email protected]", "[email protected]"];

$.validator.addMethod('emailNotBanned', function(value, elem, param) {
  return bannedEmails.indexOf(value) < 0;
}, 'This email address is banned.');

// Applying these rules
$('#myForm').validate({
  rules: {
    email: {
      required: true,
      email: true,
      domainNotBanned: true,
      emailNotBanned: true
    }
  }
});

// Just for the demo
$('#myForm').on('submit', function(e) {
  e.preventDefault();
  alert("This email is valid.");
  return false;
});