@xssfox @AnOldGuy Part of the problem with post codes is that a few of them are precise enough to constitute a complete address in and of themselves. I believe that some have been sold (or leased) to corporations so it’s possible to address letters to:
{Name
{Post code}
…and have the letter be delivered successfully.
@xssfox @AnOldGuy @arcadiagt5 I lived in a small town in Nebraska, US where a letter addressed just to me with the city, state and post code got to me because the local post office just knew where to find me.