After reading this,I bought one of the letter box covers as some of my dogs go grabbing anything that is put through the letter box. Anyway our postie brought it today, told him what it was and why I got it. He said if he puts his fingers through the letterbox and got bitten it would be his own fault as he would be trespassing. He called another postie over and he said the same thing. I do have a very large post box on my wall, which he uses but despite taping my letterbox up, leaflet delivers ignore the box, tear the tape of the letterbox and stuff things through, seen them trying to do it even when there is a dog going mental behind the door, which they can see as it is part glass. The letterbox cover is good though just pulled the backing off and stuck it over the letterbox, locked it so no dogs can get anyone's fingers now.