Paypal says direct notifications doesn't work

Just received a mail from paypal about our site.

Translated and summed up it says: "Check the server that deals with PayPals notifications about direct payment (directbuymessage). It doesn't work sending directbuymessages to the following URL:

Directbuymessages will be disabled for your account if this problem persists."

So how do we fix this? :slight_smile: