@resist1984 @rysiek @grimmware @kensanata Absolutely, it's not trivial to run an email server. That applies to any federated service I'm afraid.

You need to cope with spam and other abuse (phishing, malware) and after 20 years Matrix or Mastodon will be most likely just as complex as email.

Fax is really simple architecture, you just need to know other party's number. Same as in P2P.