public static function tearDownBeforeClass()
 {
     unset($_SERVER['SERVER_NAME']);
     if (isset(Tests_Two_Factor_Email::$phpmailer)) {
         $GLOBALS['phpmailer'] = Tests_Two_Factor_Email::$phpmailer;
         Tests_Two_Factor_Email::$phpmailer = null;
     }
     unset(Tests_Two_Factor_Email::$mockmailer);
     parent::tearDownBeforeClass();
 }