public void SendNewsItems(FeedItem[] items, string[] addresses)
        {
            if (items == null)
                throw new ArgumentNullException(nameof(items));

            foreach (var item in items)
                SendNewsItem(item, addresses);
        }
        public void SendNewsItem(FeedItem item, string[] addresses)
        {
            if (item == null)
                throw new ArgumentNullException(nameof(item));
            if (addresses == null)
                throw new ArgumentNullException(nameof(addresses));
            if (addresses.Length < 1)
                return;

            var message = new MailMessage();
            message.From = new MailAddress(senderAddress);
            foreach (var address in addresses)
            {
                message.To.Add(new MailAddress(address));
            }
            message.Subject = item.Title;
            message.Body = item.Summary;
            message.IsBodyHtml = true;

            smtpClient.Send(message);
        }