rich1.0ChipTuner (npub1qd…3fqm7)https://nostr.now/npub1qdjn8j4gwgmkj3k5un775nq6q3q7mguv5tvajstmkdsqdja2havq03fqm7njumphttps://nostr.nowOutbox model does. Clients get relays hints on every just about event signed (look at the event data) on this reply for example. Clients can discover these quiet/tiny relays if users want to. I personally don't like the outbox model for privacy and also security reasons, but many modern clients do support outbox to prevent this.