Paypal says direct notifications doesn't work

Hi,
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: http://www.nilalf.net/store/payment-return/paypal-express

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

So how do we fix this? :slight_smile:

/Robert