When I mailed them this reply, I was very aware
not to use anything which would conform with their opt-out option. The address I send it to was the personal contact address displayed on their website. And the subject dosn't contain anything looking like "Remove me" as their opt-out required.
And their spamming session did end, so I guess they did perform a
listwashing else I'll just have to wait and see what the next spamming spree brings.
And for the record, here in Denmark there are laws prohibiting any form of spam send to a reciever that didn't explicit applied for it.