Post office mail with hole?

Question

Has anybody seen a little hole on mail envelopes when you receive your mail? Mine has it sometimes.

It looks like cut with your fingers on the border of the envelope.

Answer 1

Sure, each letter goes through miles of belts, and sorters. and along the way they get damaged and worn.

A letter that goes through a maching with belts, gets pulled by upto 3 belts at 1 time and if 2 of the belts are going at different speeds then is it can cause those kinds of rips.

Answer 2

Yes.  I think it happens when it goes through the mail sorter.