Email is already nicely federated, but I think it's time for a change. Services like protonmail claim to offer encryption between users, but you can't host your own instance. It would be awesome if there was a spec somewhere for a federated email service that defines...
Das Fediverse wächst weiter: Über das zugrundeliegende Protokoll ActivityPub soll in diesem Jahr auch die Blogging- und Newsletter-Plattform Ghost föderieren.