But email is the same as xmpp or DMs on "social media" - you can comunícate with various instances. the problem arise with groups (so mailing list, multi user c

But email is the same as xmpp or DMs on "social media" - you can comunícate with various instances. the problem arise with groups (so mailing list, multi user chat or "communities") - in case of email you have mailing list which is not federated and is tied to particular server / address... same issue so it wasn't exactly solved. it's just it's used slightly differently.