Clearly have been gossip too much and I'm no longer sure if by inbox, you mean the nostr DMs or just public comments/events, or both 😂

Many problems with nostr DMs, is why even with auth, most people agree that they suck in current form. There is no key rotation or 'forward secrecy', and a compromise for either parties key, means leak of all messages. Auth is barely a bandaid. Some clients trying to innovate with giftwraps, but I haven't seen this working despite claims it's implemented in coracle and amethyst for 'advanced dms', also not sure about the rotation there. Private groups, those do have key rotation, just in coracle only and unaudited by a security team afaik.