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Re:Introducing ProtonMail's Tor hidden service by o- on Friday January 20, 2017 @06:56AM (#13443164)
This is a great idea [your edit]!

And its already being developed by some (not protonmail though). See https://github.com/ehloonion/onionmx

Re:Introducing ProtonMail's Tor hidden service by mike-cardwell on Friday January 20, 2017 @08:52AM (#13443748)
Thanks for pointing this out to me. I have added suitable onionmx DNS SRV records and reconfigured my mail server to utilise them:

  mike@snake:~$ dig +short srv _onion-mx._tcp.grepular.com
  0 5 25 grepularmmmiatj7.onion.
  mike@snake:~$