protected void doPost(HttpServletRequest request, HttpServletResponse response)
     throws ServletException, IOException {
   NewsletterDao newsletterDao = new NewsletterDaoBean();
   String Email = request.getParameter("email");
   String mailNews = request.getParameter("mailInput");
   Newsletter n = new Newsletter();
   List<Newsletter> newsletters = null;
   if (mailNews != null) {
     newsletters = newsletterDao.getAllNewsletter();
     for (Newsletter news : newsletters) {
       NewsletterUtils.sendNewsletter(news.getEmail(), mailNews);
     }
     return;
   }
   n.setEmail(Email);
   newsletterDao.addNewsletter(n);
 }