[nobody9999]

>Just imagine, every drifter, nomad and homeless person were required to set up a mailbox. It's just silly.

They don't have to. Just have mail sent to:

  Joe/Jane Drifter
  General Delivery
  TownNearWhereYouSquat, <State> <ZipCode of post office>

Or at least that's how it's been done for decades.

[philwelch]

Yeah but they never have to come in and pick it up and I doubt the post office retains that mail in perpetuity until it’s picked up.

[nobody9999]

https://www.usglobalmail.com/usps-general-delivery/