Best solution is if the relay is on the network too, be that onion services or i2p.
I know there are a few Onion nostr relays, not sure on i2p. If you find i2p ones, let me know
Ok ok ok, if I find one I’ll make sure to inform ya.
Also do you know of of how to…
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As far as I know PGP to relay would have to be custom coded. In my subjective opinion, you're better off whitelisting by nostr public key, since the metadata is on the relay anyway.