yes, such a protocol could exist, i'm not 100% sure yet but i am pretty sure that you can, in principle, make a relay require an immediate zap in order to release an authentication lock
spam can be handle it with some new NIP that will force to pay to the destination a x amount in order to receive the "email like" message.
Call it here nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6
yes, such a protocol could exist, i'm not 100% sure yet but i am pretty sure that you can, in principle, make a relay require an immediate zap in order to release an authentication lock
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