Mailman

I don't understand why the mailman delivers the mail so late on Saturdays. It's 3:45 PM and no sign of him yet. What is different about Saturday? Maybe he gets to come in late or something. And it's strange to me that he is not in uniform on Saturdays, either. Another thing that bothers me is if he has a package for me he does not knock on my door. I have had a couple of opportunities over the years to verify this. He just puts a delivery notification in my mailbox and I have to go to the post office to pick it up. Irritating!