* Search logs from these bots will be automatically removed.
     */
    @Size(max = 10000)
    public String purgeByBots;

    /**
     * Email addresses to receive system notifications.
     * Multiple addresses can be specified, separated by commas.
     */
    @Size(max = 1000)
    public String notificationTo;

    /**
     * Enable or disable search suggestions based on search logs.

                postcard.setFrom(fessConfig.getMailFromAddress(), fessConfig.getMailFromName());
                postcard.addReplyTo(fessConfig.getMailReturnPath());
                stream(toAddresses).of(stream -> stream.forEach(address -> {
                    postcard.addTo(address);
                }));
                BeanUtil.copyMapToBean(dataMap, postcard);
            });
            saveInfo(messages -> messages.addSuccessSendTestmail(GLOBAL));

            "Crawler,crawler,Bot,bot,Slurp,Yeti,Baidu,Steeler,ichiro,hotpage,Feedfetcher,ia_archiver,Y!J-BRI,Google Desktop,Seznam,Tumblr,YandexBot,Chilkat,CloudFront,Mediapartners,MSIE 6";

    /** Default from email address for notifications. */
    public static final String DEFAULT_FROM_EMAIL = "Administrator <root@localhost>";

    // ============================================================
    // Crawler Info Map Keys

    public static final String LABELS_HOME_PHONE = "{labels.homePhone}";

    /** The key of the message: Home Postal Address */
    public static final String LABELS_user_homePostalAddress = "{labels.user_homePostalAddress}";

    /** The key of the message: Home Postal Address */
    public static final String LABELS_HOME_POSTAL_ADDRESS = "{labels.homePostalAddress}";

    /** The key of the message: labeledURI */

     */
    String getMailFromName();

    /**
     * Get the value for the key 'mail.from.address'. <br>
     * The value is, e.g. root@localhost <br>
     * comment: Email address to use in the From field.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getMailFromAddress();