Postal Locations

A postal delivery person today (May 9) on 45th Ave just attempted to intimidate my wife. He was angry because she asked him not to use our property as a thoroughfare to the next door neighbor's mail box when there is a side walk and clear access from the side walk. He also threatened our mail and our car and home when he refused to use the sidewalk instead of walking on our property, “No I won’t” he said, then when my wife told him she would inform his supervisor he said “go ahead, you should be careful I have your mail, and I know where you live”. He did not know I could hear them trough the window.

what if I send a letter but forgt to put stamp on ?