systemProperties.store();
        } catch (final Exception e) {
            logger.warn("Failed to send a test mail.", e);
            saveError(messages -> messages.addErrorsFailedToSendTestmail(GLOBAL));
        }

        return redirectByParam(AdminGeneralAction.class, "notificationTo", form.notificationTo);
    }

    /**
     * Updates the general system configuration settings.

     * message: Failed to send a test mail.
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addErrorsFailedToSendTestmail(String property) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(ERRORS_failed_to_send_testmail));
        return this;
    }

    /**