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Does Google Groups do what you want?

I think OP is specifically looking for something they can self-host.

Besides, Google Groups is borderline abandoned. It's stuck awkwardly between being a Usenet client, a mailing list archive, and a web forum, and I don't think it's seen much interest from Google's side in a long time.

And if I wasn't going to self-host, it would be as far away from Google as is possible to get because of their habit of randomly abandoning things with (relatively) little notice.

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