I built a sneakernet version of this that let me send mail between my Apple II at home and my friends on a network of Apple II’s at the public high school.
One of these guys would run a floppy disc over when they came to my house for lunch that carried the messages to sync.
With the cheap tech we have now, I think we could easily cover continents this way, and perhaps further with shortwave, etc.
@deutrino @feonixrift really the only thing I don’t have a turnkey answer for is some kind of addressing scheme that works w/o centralized name resolution. We use DNS and MX records for this now, and maybe we could keep using dns in an async-oriented network, but I don’t know how off the top of my head :)
Store-and-forward is also facilitated by the ephemeral nature of the messages. People are much more willing to hang onto others' messages when it's for a limited time.
Authenticated encryption also makes it possible to do this securely.
A bunch of technomancers in the fediverse. Keep it fairly clean please. This arcology is for all who wash up upon it's digital shore.