Nothing blocks Nostr clients from sending Nostr events to one another directly, without a relay.
Both clients need to be online and show some IP that the other will connect into. Totally feasible.
We can even use a Push Notification server to send phone to phone messages with background apps. But that's kinda like having a relay in the middle.
https://simplex.chat/ Simplex has so few servers, and if you can combine Nostr, it's a great product!
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