Earlier quoted context omitted.
> It's in a docker image on my file server At this point you could|should run a proper mailsever with fetchmail. I'm running [0] specifically as a local archive solution. Now that can be accessed by Thunderbird. docker.io/mailserver/docker-mailserver
Interesting, I might try that. Your link seems to be broken, though - is this the right one? https://hub.docker.com/r/mailserver/docker-mailserver
But yeh, this one.