private IEnumerable <MailMessageData> PrepareMessages(PostMailViewModel postMailViewModel)
        {
            var users    = _userListData.GetData().ToList();
            var messages = new List <MailMessageData>();

            for (int i = 0; i < users.Count; i++)
            {
                messages.Add(new MailMessageData()
                {
                    To      = users[i].Email.ToString(),
                    From    = _smtpConfig.User,
                    Subject = postMailViewModel.Post.Title,
                    Body    = postMailViewModel.Post.Content
                });
            }
            return(messages);
        }