// Setup mock configuration with blank webhook URLs
        ComponentUtil.setFessConfig(new MockFessConfig() {
            @Override
            public String getSlackWebhookUrls() {
                return "";
            }
        });

        MockSMailPostingDiscloser discloser = new MockSMailPostingDiscloser();

        // Should return early without doing anything
        try {

        return StringUtil.isNotBlank(getNotificationTo()) || StringUtil.isNotBlank(getSlackWebhookUrls())
                || StringUtil.isNotBlank(getGoogleChatWebhookUrls());
    }

    default void setSlackWebhookUrls(final String value) {
        setSystemProperty(Constants.SLACK_WEBHOOK_URLS_PROPERTY, value);
    }

    default String getSlackWebhookUrls() {

        // https://api.slack.com/messaging/webhooks#posting_with_webhooks
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String slackWebhookUrls = fessConfig.getSlackWebhookUrls();
        if (StringUtil.isBlank(slackWebhookUrls)) {
            return;
        }
        final String body = toSlackMessage(discloser);