[cyanoacry]

There are several I'm on (canard-aviators and gns480-users), and they've been active for something close to a decade. (And there are still emails every day!)

Frustratingly, both of these groups have great content (manuals, tips, documentation) uploaded to Yahoo Groups. It's going to be a real loss.

[segfaultbuserr]

You may want to start archiving them immediately using the advice from this comment. https://news.ycombinator.com/item?id=21272524

I think there's an important lesson to learn: unlike offline, many online communities only exist because people find it interesting, and there exist many things that no one will take care about. If not now, when? It not you, who?