public Task SendAsync(Email email)
        {
            var taskCompletionSource = new TaskCompletionSource <SendEmailResult>();

            using (var mailMessage = CreateMailMessage(email))
            {
                _simpleEmailService.BeginSendEmail(CreateSendEmailRequest(mailMessage),
                                                   e =>
                {
                    var result = _simpleEmailService.EndSendEmail(e);
                    taskCompletionSource.SetResult(result.SendEmailResult);
                }, null);
            }
            return(taskCompletionSource.Task);
        }