diff --git a/conandata.yml b/conandata.yml
index 6feb46e5..4cf74beb 100644
--- a/conandata.yml
+++ b/conandata.yml
@@ -1 +1 @@
-version: "5.4.0-alpha.0"
\ No newline at end of file
+version: "5.4.1"
diff --git a/include/Arcus/Error.h b/include/Arcus/Error.h
index f3efa57a..a35968ba 100644
--- a/include/Arcus/Error.h
+++ b/include/Arcus/Error.h
@@ -19,6 +19,7 @@ enum class ErrorCode
     BindFailedError, ///< Bind to IP and port failed.
     AcceptFailedError, ///< Accepting an incoming connection failed.
     SendFailedError, ///< Sending a message failed.
+    MessageTooBigError, ///< Sending a message failed because it was too big.
     ReceiveFailedError, ///< Receiving a message failed.
     UnknownMessageTypeError, ///< Received a message with an unknown message type.
     ParseFailedError, ///< Parsing the received message failed.
@@ -27,6 +28,8 @@ enum class ErrorCode
     InvalidStateError, ///< Socket is in an invalid state.
     InvalidMessageError, ///< Message being handled is a nullptr or otherwise invalid.
     Debug, // Debug messages
+
+    // When changing this list, don't forget to apply the same changes on pyArcus/python/Error.sip
 };
 
 /**
diff --git a/include/Arcus/Socket.h b/include/Arcus/Socket.h
index 8c6b3d61..dcb83994 100644
--- a/include/Arcus/Socket.h
+++ b/include/Arcus/Socket.h
@@ -114,7 +114,7 @@ class Socket
     /**
      * Send a message across the socket.
      */
-    virtual void sendMessage(MessagePtr message);
+    virtual bool sendMessage(MessagePtr message);
 
     /**
      * Remove and return the next pending message from the queue with condition blocking.
diff --git a/src/Socket.cpp b/src/Socket.cpp
index 158c68ea..69487cac 100644
--- a/src/Socket.cpp
+++ b/src/Socket.cpp
@@ -203,21 +203,29 @@ void Socket::close()
         delete d->thread;
         d->thread = nullptr;
     }
+
     // Notify all in case of closing because the waiting threads need to know
     // that this socket has been closed and they should not wait any more.
     d->message_received_condition_variable.notify_all();
 }
 
-void Socket::sendMessage(MessagePtr message)
+bool Socket::sendMessage(MessagePtr message)
 {
     if (! message)
     {
         d->error(ErrorCode::InvalidMessageError, "Message cannot be nullptr");
-        return;
+        return false;
+    }
+
+    if (message->ByteSizeLong() > Private::message_size_maximum)
+    {
+        d->error(ErrorCode::MessageTooBigError, "Message is too big to be sent");
+        return false;
     }
 
     std::lock_guard<std::mutex> lock(d->sendQueueMutex);
     d->sendQueue.push_back(message);
+    return true;
 }
 
 MessagePtr Socket::takeNextMessage()
diff --git a/src/Socket_p.h b/src/Socket_p.h
index e3eb2c42..33f5873f 100644
--- a/src/Socket_p.h
+++ b/src/Socket_p.h
@@ -43,7 +43,7 @@
 #define VERSION_MINOR 0
 
 #define ARCUS_SIGNATURE 0x2BAD
-#define SIG(n) (((n)&0xffff0000) >> 16)
+#define SIG(n) (((n) & 0xffff0000) >> 16)
 
 #define SOCKET_CLOSE 0xf0f0f0f0
 
@@ -338,33 +338,35 @@ void Socket::Private::run()
 // Send a message to the connected socket.
 void Socket::Private::sendMessage(const MessagePtr& message)
 {
-    uint32_t header = (ARCUS_SIGNATURE << 16) | (VERSION_MAJOR << 8) | (VERSION_MINOR);
+    const uint32_t header = (ARCUS_SIGNATURE << 16) | (VERSION_MAJOR << 8) | (VERSION_MINOR);
     if (platform_socket.writeUInt32(header) == -1)
     {
         error(ErrorCode::SendFailedError, "Could not send message header");
         return;
     }
 
-    uint32_t message_size = message->ByteSizeLong();
+    const uint32_t message_size = message->ByteSizeLong();
     if (platform_socket.writeUInt32(message_size) == -1)
     {
         error(ErrorCode::SendFailedError, "Could not send message size");
         return;
     }
 
-    uint32_t type_id = message_types.getMessageTypeId(message);
+    const uint32_t type_id = message_types.getMessageTypeId(message);
     if (platform_socket.writeUInt32(type_id) == -1)
     {
         error(ErrorCode::SendFailedError, "Could not send message type");
         return;
     }
 
-    std::string data = message->SerializeAsString();
+    const std::string data = message->SerializeAsString();
     if (platform_socket.writeBytes(data.size(), data.data()) == -1)
     {
         error(ErrorCode::SendFailedError, "Could not send message data");
+        return;
     }
-    DEBUG(std::string("Sending message of type ") + std::to_string(type_id) + " and size " + std::to_string(message_size));
+
+    DEBUG(std::string("Sent message of type ") + std::to_string(type_id) + " and size " + std::to_string(message_size));
 }
 
 // Handle receiving data until we have a proper message.
@@ -571,4 +573,4 @@ void Socket::Private::checkConnectionState()
 }
 } // namespace Arcus
 
-#endif // SOCKET_P_H
\ No newline at end of file
+#endif // SOCKET_P_H