> Literally any open-source forum or wiki meets all the requirements except possibly "federated" (depending on whether people set up a dump->restore to another machine), but is much more welcoming to ad-hoc contributors who don't want to subscribe to 10,000 emails per day just to get replies to their own posts.

I know that mailing clients have gotten worse, but not _that_ worse.

> The contrast of 3/4 to forums is utter bullshit. What security/privacy risk is there in using a forum? Are they going to leak my email address or something?

Most of them employ a whole bunch of google analytics for reasons unclear. That should be sufficient.

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Though unfortunately I disagree with the OP. Those are arguments as to why it would be nice if email stuck around. But it won't. Just because the problems come from "bad deployments of anti-spam policies" doesn't change the fact that the "bad deployments" are literally _the majority of email_.