def action_previous(app) -> None:
    """Show the previous email message by finding the next lower ID from the list of envelope IDs."""
    try:
        if app.reload_needed:
            app.action_fetch_list()

            ids = sorted(
                (int(envelope["id"]) for envelope in app.all_envelopes), reverse=True
            )
            for envelope_id in ids:
                if envelope_id < int(app.current_message_id):
                    app.current_message_id = envelope_id
                    app.show_message(app.current_message_id)
                    return
            app.show_status("No older messages found.", severity="warning")
            app.action_oldest()
        else:
            app.show_status("Failed to fetch envelope list.", severity="error")
    except Exception as e:
        app.show_status(f"Error: {e}", severity="error")