Abstract: An embodiment of the present disclosure receives a respective set of input messages from a corresponding source system, with the messages of each set of input messages being received in a corresponding chronological (time) order. The input messages are processed using parallel processing approaches to generate corresponding output messages, with each output message being generated for delivery to a corresponding destination system. The destination system for each output message is identified only during such processing of the input messages. The output messages are queued and an output message to a destination system is transmitted only after output messages of all prior input messages from the same source system to the destination system are transmitted, while permitting output messages generated by processing of input messages from different source systems being permitted to be transmitted out-of-sequence.