The mailman? For what? Stuffing my box with a bunch of junk I don't want? And even then the guy can't do that right. Half the time it's all smashed up or dropped on the ground. That deserves a tip?
The garbage man. How does one tip the garbabe man? Where do you put it? Do you get up extra early and go hand it to him personally? What if he's filling in for the usual guy? How many here can pick out your garbage man in a line-up?
Why is tipping always a one way street? The customer is always expected to tip the service provider. How many times have you gone to your regular hair stylist and had them say "oh no, this one's on me." I went to the same person for years and always tipped well. Not once did they return the favor.
