dataMap.put(StringUtil.decapitalize(entry.getKey()), entry.getValue());
            }

            String hostname = fessConfig.getMailHostname();
            if (StringUtil.isBlank(hostname)) {
                hostname = ComponentUtil.getSystemHelper().getHostname();
            }
            dataMap.put("hostname", hostname);

     * Get the value for the key 'mail.hostname'. <br>
     * The value is, e.g.  <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getMailHostname();

    /**
     * Get the value for the key 'mail.hostname' as {@link Integer}. <br>
     * The value is, e.g.  <br>