Does the message delivery sequence guarantee delivery when they are stored?

The sequence of message delivery when they are saved depends on the specific system or library you are using. In standard Python data structures, such as lists or queues, the order is preserved, but when it comes to inter-process communication or network protocols, the guarantee of order depends on the implementation.

For example, if you use a message queue with support for order (such as RabbitMQ with FIFO queue settings), then the delivery sequence is preserved. Otherwise, in case of parallel processing or absence of special mechanisms, the order may be disrupted.

Therefore, simply saving messages does not guarantee their sequential delivery — additional mechanisms or configurations are required for that.