void main(String[] arguments) throws Exception {
    if (arguments.length != 3
            || !arguments[0].matches("[A-Za-z0-9_-]+")) {
        IO.println(
            "Usage: java DynamicMediatorOrchestrator.java "
            + "<mediator-name> <from-mailbox> <to-mailbox>"
        );
        return;
    }

    var mediator = arguments[0];
    var from = arguments[1];
    var to = arguments[2];

    FileMessageBoard.publish(
        "mediators/" + mediator + "/inbox",
        new Message("ROUTE", from + "\n" + to)
    );

    IO.println(
        "Requested: " + mediator + " " + from + " -> " + to
    );
}