> Pretty sure this is how all postal services worked. Nope. For ages (and possibly still today), the only thing that can be casually read by the US post office

> Pretty sure this is how all postal services worked. Nope. For ages (and possibly still today), the only thing that can be casually read by the US post office are the parts of the mailpiece that can be seen without opening the mailpiece. So, the entire contents of postcards can be read at any time. The entire contents of envelopes, packages, and the like cannot. Engage your brain for a second and ask yourself if the "Founding Fathers" would really have set up a system where the government gets to root through its citizens' private communications without a warrant. And yes, you can point to how the third-party doctrine enables all sorts of warrantless investigation of the private communications of modern day USians, but the state of the world was way different back when that doctrine was solidified. In a just world, we'd see massive reform to the doctrine to bring it in line with how folks interact with third-parties these days, but authoritarians don't like to be stripped of their tools of oppression and clandestine, unchecked surveillance and will fight very hard to keep them.