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Even before Discourse I recall forum software that managed mailing lists. There was usually a sticky with a message warning forum users that each post is sent out as an email, so be respectful of this and format accordingly should you desire a response.

EDIT:

I actually don't know if it was forum software or just mailman plugged into the forum somehow.

I tried using Discourse for a while.

The setup was not so bad.

But it really failed as a mailing list, as there was no way to respond to the sender without responding to all. There was a plugin that caused more issues than it solved.

It has been several months, not sure if it improved since then.

Looks interesting but as with the sr.hut stuff, Rails + Ember + Postgres + Redis is too much for a mailing list.

Take a look at Mailcast:

https://github.com/nodemailer/mailcast

Requirements: Nodejs v8+ Redis MongoDB Unblocked port 25

Alas, that too is the newsletter / marketing style of mailing list.