async Task OnSendAsync(IList <Message> messageList)
        {
            TimeoutHelper timeoutHelper = new TimeoutHelper(this.OperationTimeout, true);

            using (AmqpMessage amqpMessage = AmqpMessageConverter.BatchSBMessagesAsAmqpMessage(messageList, true))
            {
                SendingAmqpLink amqpLink = null;
                try
                {
                    amqpLink = await this.SendLinkManager.GetOrCreateAsync(timeoutHelper.RemainingTime()).ConfigureAwait(false);

                    if (amqpLink.Settings.MaxMessageSize.HasValue)
                    {
                        ulong size = (ulong)amqpMessage.SerializedMessageSize;
                        if (size > amqpLink.Settings.MaxMessageSize.Value)
                        {
                            // TODO: Add MessageSizeExceededException
                            throw new NotImplementedException("MessageSizeExceededException: " + Resources.AmqpMessageSizeExceeded.FormatForUser(amqpMessage.DeliveryId.Value, size, amqpLink.Settings.MaxMessageSize.Value));
                            ////throw Fx.Exception.AsError(new MessageSizeExceededException(
                            ////Resources.AmqpMessageSizeExceeded.FormatForUser(amqpMessage.DeliveryId.Value, size, amqpLink.Settings.MaxMessageSize.Value)));
                        }
                    }

                    Outcome outcome = await amqpLink.SendMessageAsync(amqpMessage, this.GetNextDeliveryTag(), AmqpConstants.NullBinary, timeoutHelper.RemainingTime()).ConfigureAwait(false);

                    if (outcome.DescriptorCode != Accepted.Code)
                    {
                        Rejected rejected = (Rejected)outcome;
                        throw Fx.Exception.AsError(AmqpExceptionHelper.ToMessagingContractException(rejected.Error));
                    }
                }
                catch (Exception exception)
                {
                    throw AmqpExceptionHelper.GetClientException(exception, amqpLink?.GetTrackingId());
                }
            }
        }