protected function sendEmailNotification($subject, $message)
    {
        $superUsers = UsersManagerApi::getInstance()->getUsersHavingSuperUserAccess();

        foreach ($superUsers as $superUser) {
            $mail = new Mail();
            $mail->setDefaultFromPiwik();
            $mail->addTo($superUser['email']);
            $mail->setSubject($subject);
            $mail->setWrappedHtmlBody($message);
            $mail->send();
        }
    }