I would imagine there is a certain protocol mail carriers must use to deliver the  mail. At least in the United States there must be a certain protocol. This is a video from Russia where I guess the letter carrier did not want to leave the important items out in the snow.

There was no mail slot or mailbox so he did the next best think. He simply kicked a hole in the door. I wonder if the postal customer if given the choice would go for replacing the door or having wet mail. It seems a bit over the top if you ask me.