diff --git a/src/Socialbox/Classes/StandardMethods/EncryptionChannel/EncryptionChannelReceive.php b/src/Socialbox/Classes/StandardMethods/EncryptionChannel/EncryptionChannelReceive.php
index fa0db4e..3989e67 100644
--- a/src/Socialbox/Classes/StandardMethods/EncryptionChannel/EncryptionChannelReceive.php
+++ b/src/Socialbox/Classes/StandardMethods/EncryptionChannel/EncryptionChannelReceive.php
@@ -2,18 +2,20 @@
 
     namespace Socialbox\Classes\StandardMethods\EncryptionChannel;
 
+    use Exception;
     use Socialbox\Abstracts\Method;
-    use Socialbox\Classes\Validator;
+    use Socialbox\Classes\Logger;
     use Socialbox\Enums\StandardError;
     use Socialbox\Enums\Status\EncryptionChannelStatus;
     use Socialbox\Exceptions\DatabaseOperationException;
-    use Socialbox\Exceptions\Standard\InvalidRpcArgumentException;
+    use Socialbox\Exceptions\RpcException;
     use Socialbox\Exceptions\Standard\MissingRpcArgumentException;
     use Socialbox\Exceptions\Standard\StandardRpcException;
     use Socialbox\Interfaces\SerializableInterface;
     use Socialbox\Managers\EncryptionChannelManager;
     use Socialbox\Objects\ClientRequest;
     use Socialbox\Objects\RpcRequest;
+    use Socialbox\Socialbox;
 
     class EncryptionChannelReceive extends Method
     {
@@ -27,10 +29,6 @@
             {
                 throw new MissingRpcArgumentException('channel_uuid');
             }
-            elseif(!Validator::validateUuid($rpcRequest->getParameter('channel_uuid')))
-            {
-                throw new InvalidRpcArgumentException('channel_uuid', 'The given channel uuid is not a valid UUID V4');
-            }
 
             try
             {
@@ -82,10 +80,46 @@
                 $messages = EncryptionChannelManager::receiveData(
                     $rpcRequest->getParameter('channel_uuid'), $encryptionChannel->determineRecipient($requestingPeer->getAddress(), true)
                 );
+                $messageUuids = array_map(fn($message) => $message->getUuid(), $messages);
 
                 if($acknowledge)
                 {
-                    EncryptionChannelManager::acknowledgeMessagesBatch($rpcRequest->getParameter('channel_uuid'), array_map(fn($message) => $message->getUuid(), $messages));
+                    EncryptionChannelManager::acknowledgeMessagesBatch(
+                        channelUuid: $rpcRequest->getParameter('channel_uuid'),
+                        messageUuids: $messageUuids,
+                    );
+
+                    $externalPeer = $encryptionChannel->getExternalPeer();
+                    if($externalPeer !== null)
+                    {
+                        try
+                        {
+                            $rpcClient = Socialbox::getExternalSession($externalPeer->getDomain());
+                            $rpcClient->encryptionChannelAcknowledgeMessages(
+                                channelUuid: (string)$rpcRequest->getParameter('channel_uuid'),
+                                messageUuids: $messageUuids,
+                                identifiedAs: $requestingPeer->getAddress()
+                            );
+                        }
+                        catch(Exception $e)
+                        {
+                            try
+                            {
+                                EncryptionChannelManager::rejectMessage($rpcRequest->getParameter('channel_uuid'), $rpcRequest->getParameter('message_uuid'), true);
+                            }
+                            catch (DatabaseOperationException $e)
+                            {
+                                Logger::getLogger()->error('Error rejecting message as server', $e);
+                            }
+
+                            if($e instanceof RpcException)
+                            {
+                                throw StandardRpcException::fromRpcException($e);
+                            }
+
+                            throw new StandardRpcException('Failed to acknowledge the message with the external server', StandardError::INTERNAL_SERVER_ERROR, $e);
+                        }
+                    }
                 }
             }
             catch(DatabaseOperationException $e)
diff --git a/src/Socialbox/Managers/EncryptionChannelManager.php b/src/Socialbox/Managers/EncryptionChannelManager.php
index ebf10bc..f5249a8 100644
--- a/src/Socialbox/Managers/EncryptionChannelManager.php
+++ b/src/Socialbox/Managers/EncryptionChannelManager.php
@@ -604,23 +604,42 @@
          * @return EncryptionChannelMessageRecord[] An array of message objects returned
          * @throws DatabaseOperationException Thrown if there was a database operation error
          */
-        public static function receiveData(string $channelUuid, EncryptionMessageRecipient|string $recipient): array
+        public static function receiveData(string $channelUuid, EncryptionMessageRecipient|string $recipient, int $limit=100): array
         {
             if(!Validator::validateUuid($channelUuid))
             {
                 throw new InvalidArgumentException('The given Channel UUID is not a valid V4 UUID');
             }
 
+            elseif(is_string($recipient))
+            {
+                $recipient = EncryptionMessageRecipient::tryFrom($recipient);
+                if($recipient === null)
+                {
+                    throw new InvalidArgumentException('The given recipient is not a valid EncryptionMessageRecipient');
+                }
+            }
+
             if($recipient instanceof EncryptionMessageRecipient)
             {
                 $recipient = $recipient->value;
             }
+            else
+            {
+                throw new InvalidArgumentException('The given recipient is not a valid EncryptionMessageRecipient');
+            }
+
+            if($limit < 1)
+            {
+                throw new InvalidArgumentException('The limit cannot be less than 1');
+            }
 
             try
             {
-                $stmt = Database::getConnection()->prepare("SELECT * FROM encryption_channels_com WHERE channel_uuid=:channel_uuid AND recipient=:recipient AND status='SENT' ORDER BY timestamp LIMIT 100");
+                $stmt = Database::getConnection()->prepare("SELECT * FROM encryption_channels_com WHERE channel_uuid=:channel_uuid AND recipient=:recipient AND status='SENT' ORDER BY timestamp LIMIT :limit");
                 $stmt->bindParam(':channel_uuid', $channelUuid);
                 $stmt->bindParam(':recipient', $recipient);
+                $stmt->bindParam(':limit', $limit);
                 $stmt->execute();
                 $results = $stmt->fetchAll();
 
@@ -690,6 +709,14 @@
                 throw new InvalidArgumentException('The given Message UUIDs array is empty');
             }
 
+            foreach($messageUuids as $messageUuid)
+            {
+                if(!Validator::validateUuid($messageUuid))
+                {
+                    throw new InvalidArgumentException('The given Message UUID is not a valid V4 uuid');
+                }
+            }
+
             $placeholders = implode(',', array_fill(0, count($messageUuids), '?'));
             $query = "UPDATE encryption_channels_com SET status='RECEIVED' WHERE channel_uuid=:channel_uuid AND uuid IN ($placeholders)";