Is there an outage at Laposta?
Do you think there is an outage, for instance because you are unable to log in? Please check https://status.laposta.nl/. There you can immediately see whether there is an outage. If this is the case, you can also sign up to receive a notification as soon as everything is working again.
If the status page does not report an outage and you are still unable to log in, please see Solving login problems.