jQuery.validator.addMethod("mxvalid", function(value, element) {
      $.ajax({
        url: 'http://localhost:4567/email-check',
        type: 'GET',
        dataType: 'jsonp',
        data: $.param( $(element) ),

        success: function(data, textStatus) {
          console.info("IN CALLBACK");
          if (data == 'success') {
            console.info(data);
            return true;
          }
          else{
            console.info(data);
            return false;
          };
        }
      });
    });