What's the mail archive that can be set up with the same ease of use and permissions as slack? What, are you going to say hypermail? Nobody has put together a

What's the mail archive that can be set up with the same ease of use and permissions as slack? What, are you going to say hypermail? Nobody has put together a simple solution in the mail domain. Maybe there's a market for it - turns out someone might pay for it if it's better than the slack experience.