A woman has been left horrified after learning that marks left on her letterbox and gate have a disturbing meaning, after she sought help on social media to explain the markings.

The front gate, letterbox, footpath and front door were the most common places for a postie to be attacked. Most of the dog attacks happened out the front of the house. Picture: Australia Post.

Mark briefly left his ute on the side of the road to open the gate on his driveway... 10 days later he received a $320 shock in his letterbox ...