setAttributeValue(result, fessConfig.getLdapAttrFacsimileTelephoneNumber(),
                        o -> user.setFacsimileTelephoneNumber(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrPostOfficeBox(), o -> user.setPostOfficeBox(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrInitials(), o -> user.setInitials(o.toString()));

     * comment: LDAP attribute for post office box.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getLdapAttrPostOfficeBox();

    /**
     * Get the value for the key 'ldap.attr.initials'. <br>
     * The value is, e.g. initials <br>
     * comment: LDAP attribute for initials.