private static final long serialVersionUID = 1L;

                @Override
                public String getMailFromAddress() {
                    return from;
                }
            });

            assertEquals(from, ComponentUtil.getFessConfig().getMailFromAddress());
        }
    }

    // Test with different hostnames
    public void test_differentHostnames() {

                    SMailCallbackContext.setPreparedMessageHookOnThread(notificationHelper::send);
                    EsStatusPostcard.droppedInto(postbox, postcard -> {
                        postcard.setFrom(fessConfig.getMailFromAddress(), fessConfig.getMailFromName());
                        postcard.addReplyTo(fessConfig.getMailReturnPath());
                        if (toAddresses.length > 0) {