Elements of a #nostrmail client i am planning in Damus Mail:

- encrypted, private, no metadata (giftwraps)
- threaded (nip10)
- titled threads (subject tag)
- to,cc,etc (sent to the npub’s inbox relays)
- replaceable event that refer to the “state” of a given thread: is it archived, labels, etc. archived threads don’t appear in inbox

This should be a solid foundation for a nostr mail client, and it could also provide an interface to nip17 dms as well.