public IActionResult Reject(string email, string key)
        {
            var unsubscribed = newsletterService.UnSubscribe(email, key);

            if (!unsubscribed)
            {
                TempData.AddErrorMessage($"This email {email} is not currently subscribed");
            }
            else
            {
                TempData.AddSuccessMessage($"Your email {email} was successfully Unsubscribed!");
            }

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