}
                final Postbox postbox = ComponentUtil.getComponent(Postbox.class);
                try {
                    final NotificationHelper notificationHelper = ComponentUtil.getNotificationHelper();
                    SMailCallbackContext.setPreparedMessageHookOnThread(notificationHelper::send);
                    EsStatusPostcard.droppedInto(postbox, postcard -> {

        };

        // Mock Postbox - no need to mock, the framework will handle it

        // Register components
        ComponentUtil.register(searchEngineClient, "searchEngineClient");
        ComponentUtil.register(systemHelper, "systemHelper");
        ComponentUtil.setFessConfig(fessConfig);
        ComponentUtil.register(notificationHelper, "notificationHelper");
        // Postbox is handled by the framework

                // Mock implementation
            }
        };
        ComponentUtil.register(notificationHelper, "notificationHelper");

        postbox = new Postbox() {
            // Mock implementation
        };
        ComponentUtil.register(postbox, "postbox");

        ComponentUtil.register(crawler, Crawler.class.getCanonicalName());
    }

    @Override
    public void tearDown() throws Exception {

            final DynamicProperties systemProperties = ComponentUtil.getSystemProperties();
            final String toStrs = fessConfig.getNotificationTo();
            final Postbox postbox = ComponentUtil.getComponent(Postbox.class);
            try {
                final String[] toAddresses;
                if (StringUtil.isNotBlank(toStrs)) {
                    toAddresses = toStrs.split(",");