.forEach(v -> modifyDeleteEntry(modifyList, attrFacsimileTelephoneNumber, v)));
        final String attrPostOfficeBox = fessConfig.getLdapAttrPostOfficeBox();
        OptionalUtil.ofNullable(user.getPostOfficeBox()).filter(StringUtil::isNotBlank)
                .ifPresent(s -> modifyReplaceEntry(modifyList, attrPostOfficeBox, s))
                .orElse(() -> getAttributeValueList(result, attrPostOfficeBox).stream()