public async Task <IActionResult> CreateAndSend(AddNewsletterFormViewModel model)
        {
            var subscribers = newsletterSerice.GetAllScubscribersEmails().ToList();
            var message     = html.Sanitize(model.Content);
            var subject     = model.Subject;

            await emailService.SendNewsletter(subscribers, subject, message);

            TempData.AddSuccessMessage($"Newsletter sent successfully!");

            return(RedirectToAction(
                       nameof(HomeController.Index),
                       "Home",
                       new { area = string.Empty }));
        }