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@delta You imply Chatmail is interoperable with non-Chatmail email. My understanding so far has been that Chatmail -- the newly-default mode of DeltaChat that runs on specially-configured servers -- breaks DeltaChat's core benefit of being able to communicate with anyone with an email address; this is due to Chatmail's mandatory encryption and novel key exchange protocol that isn't widely supported or used. OpenPGP and AutoCrypt do enjoy some support in niche MUAs, but most email users are on Gmail or Outlook¹ which don't support either. It may be possible to do this excruciatingly manually or with a specialized external tool (which doesn't exist), but for most people, this breaks the main reason anyone would choose DeltaChat over, say, XMPP+OMEMO.

¹ okay maybe Outlook does, if you configure it, maybe only if you're a paying enterprise user, and only OpenPGP and not AutoCrypt.