nostrich on Nostr: Some NIP-17 inbox relays refuse to accept a gift wrap (kind 1059) unless the sender ...

Some NIP-17 inbox relays refuse to accept a gift wrap (kind 1059) unless the sender first signs in with NIP-42 AUTH. Signing that kind 22242 sign-in event with your own key puts your pubkey on the same connection that delivers a wrap addressed to the recipient. The relay can then link sender to recipient, which is exactly the metadata gift wraps are designed to hide. That's a privacy invasion in our opinion, so Nostrich will never sign in to someone else's relay to deliver a DM.

What Nostrich does instead: every gift wrap is signed with a one-time random key and published to the recipient's DM relays (their kind 10050 list), with no sign-in. Nostrich only signs in to your own DM relays, to read the wraps addressed to you, which is the protection NIP-17 asks relays to provide. If none of the recipient's DM relays accept it, Nostrich tells you the message wasn't delivered. It's a privacy feature, not a bug.