They deliver letters even with no address or name given.
Have you ever wanted to send a postcard to a friend, but didn’t do it because you weren’t sure what the name of the street or the house number was? Well, in Iceland you could send it with a hand-drawn map on it and it would probably reach its destination. This is what happened with the letter in the picture above — it was successfully delivered to the farmers even though it contained only a hand-drawn picture roughly showing the location and a brief description of the family.