Mattermost seems to be what you're looking for, it's built around threads.
Matrix via Element and Mattermost are the best options I know off.
Nice thing with Matrix is can use the same account across multiple servers
Is matrix not more like chat channels? I'm lookint for something more like a forum / threaded conversations. Do you think it supports that sort of thing?
Sorry I think I misunderstood. Matrix has chat threads but not like Lemmy style posts.
You do Lemmy but block all federation too.
Seconding Matrix, if you like the idea of chat rather than forum post format. You can also use the account in the Matrix network at large, quite a few techy hobby groups there, and of course one-to-one chat.
You could spin up a wiki and use the Discussion tab for that. Not ideal, but shouldn't be too hard to set up on fandom.wiki, for instance - should be simple to block edits by non-registered users. YouNeedAWiki or Miraheze should also work
For years I had been using a private blog with friends. It was easy to comment on anyone's post, and easy for anyone of us to create a new post ;)
I set up a Discourse message board recently and it’s pretty easy and cheap.
emails? or local phpbb?
Phpbb is the tried and true retro solution.
My high school friends groop stood one up on a free domain for our lunchtime politics discussion group.
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