diff --git a/src/Cmp/Queues/Infrastructure/AWS/v20121105/Queue/MessageHandler.php b/src/Cmp/Queues/Infrastructure/AWS/v20121105/Queue/MessageHandler.php
index cff6f0a..3618c0b 100644
--- a/src/Cmp/Queues/Infrastructure/AWS/v20121105/Queue/MessageHandler.php
+++ b/src/Cmp/Queues/Infrastructure/AWS/v20121105/Queue/MessageHandler.php
@@ -32,6 +32,7 @@ public function __construct(JSONMessageFactory $jsonMessageFactory)
     /**
      * @param array $message
      *
+     * @return mixed
      * @throws ParseMessageException
      * @throws ReaderException
      */
@@ -53,7 +54,7 @@ public function handleMessage(array $message)
                 throw new InvalidJSONMessageException('Undefined index key Message: ' . print_r($body, true));
             }
 
-            call_user_func($this->callback, $this->jsonMessageFactory->create($body['Message']));
+            return call_user_func($this->callback, $this->jsonMessageFactory->create($body['Message']));
 
         } catch(InvalidJSONMessageException $e) {
             throw new ParseMessageException(json_encode($message),0, $e);
diff --git a/src/Cmp/Queues/Infrastructure/AWS/v20121105/Queue/QueueReader.php b/src/Cmp/Queues/Infrastructure/AWS/v20121105/Queue/QueueReader.php
index 4273c9b..a52562e 100644
--- a/src/Cmp/Queues/Infrastructure/AWS/v20121105/Queue/QueueReader.php
+++ b/src/Cmp/Queues/Infrastructure/AWS/v20121105/Queue/QueueReader.php
@@ -118,8 +118,10 @@ protected function consume($timeout)
 
         $messages = isset($result['Messages']) ? $result['Messages'] : [];
         foreach ($messages as $message) {
-            $this->messageHandler->handleMessage($message);
-            $this->sqs->deleteMessage(['QueueUrl' => $this->queueUrl, 'ReceiptHandle' => $message['ReceiptHandle']]);
+            $response = $this->messageHandler->handleMessage($message);
+            if(is_null($response) || !is_bool($response) || $response) {
+                $this->sqs->deleteMessage(['QueueUrl' => $this->queueUrl, 'ReceiptHandle' => $message['ReceiptHandle']]);
+            }
         }
     }
 }
diff --git a/src/Cmp/Queues/Infrastructure/AmqpLib/v26/RabbitMQ/Queue/MessageHandler.php b/src/Cmp/Queues/Infrastructure/AmqpLib/v26/RabbitMQ/Queue/MessageHandler.php
index 6b5f4a9..5b9980d 100644
--- a/src/Cmp/Queues/Infrastructure/AmqpLib/v26/RabbitMQ/Queue/MessageHandler.php
+++ b/src/Cmp/Queues/Infrastructure/AmqpLib/v26/RabbitMQ/Queue/MessageHandler.php
@@ -41,8 +41,10 @@ public function handleMessage(AMQPMessage $message)
 
         try {
             $task = $this->jsonMessageFactory->create($message->body);
-            call_user_func($this->callback, $task);
-            $message->delivery_info['channel']->basic_ack($message->delivery_info['delivery_tag']);
+            $response = call_user_func($this->callback, $task);
+            if(is_null($response) || !is_bool($response) || $response) {
+                $message->delivery_info['channel']->basic_ack($message->delivery_info['delivery_tag']);
+            }
         } catch(InvalidJSONMessageException $e) {
             throw new ParseMessageException(json_encode($message->getBody()), 0, $e);
         }