Mail...who uses mail?
Amazon. UPS often hands packages off to the USPS for final delivery. I think they call it Smart Post or something.
I live in an area where UPS doesn’t serve very well.
Me....I'm not quite stupid enough to go online for banking and bill paying; the closest I get is a monthly direct deposit, and that's only because there's no alternative.
Me rarely. Almost any mail or package goes into the main mail box at the post office after APC generates the postage.
If it is important, it goes UPS or Fedex.
I’ve kept a UPS Store box for so many years and found it to be cheap and effective security. They sign for my stuff, send me an alert when a package shows, and in the past few years missplaced one package (it was a Christmas flood) that was found the next day. I never have anything of real value mailed here.