Hi,
Did someone tried to configure postfix to send email from the onion address to TOR network, so email from onion addresses can communicate to other emails addresses on the tor network?
The only solution I think to have the same thing for Tor but for the mail is Bit Message. https://bitmessage.org/wiki/Main_Page
I don’t think it’s really possible to use tor for mail, as email is not/never anonymous. Moreover, Tor is decentralized, if you use it as final user for mail with a server, it is a bit weird.
Perhaps if you change the port of postfix… but legitimate an adress through tor network seems not to be easy 
For adventurous people out there, here is a guide I found on github (do give feedback if it works): https://github.com/ehloonion/onionmx/blob/master/postfix.md
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Tor looks perfectly compatible with email https://onionmail.info/paper.html