Hello All and thanks to Flynn GSoC21. Student,
Yesterday on the Sunday Mumble call Flynn was very supportive of having the email server on freedombox being able to work with the Tor network. It was said that Postfix will be the email server for freedombox.
Here a web link to a how to for Tor email and Postfix. SMTP over Hidden Services with postfix
The config page for the mapping of domain to .onion address could be on the config page for the email server on freedombox ?
Thanks Flynn and All, regards: peter