- Yes, both of them
- Yes, but not discuss
- Yes, but not announce
- Something else I definitely wrote as a reply down below
It would create a new “Mailman Archive” category to hold a sub-category for each of these lists. Nobody could post there from discuss; you would need to send it using your old fashioned e-mail client, like pine or similar.
Additionally, it could be seeded using the existing history from this here import tool: https://github.com/discourse/discourse/blob/master/script/import_scripts/mbox.rb
It’d let us forget about mailman, forever.