async def action_next(app) -> None:
    """Show the next email message by finding the next higher 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)
            for envelope_id in ids:
                if envelope_id > int(app.current_message_id):
                    app.show_message(envelope_id)
                    return

            app.show_status("No newer messages found.", severity="warning")
            app.action_newest()
        else:
            app.show_status("Failed to fetch envelope list.", severity="error")
    except Exception as e:
        app.show_status(f"Error: {e}", severity="error")