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And I am sure that with this kind of apps like Nmail it can be implemented an anti-spam feature based on proof of payment or PoW. So only whitelisted identities can send you messages.
Exactly, the key-based nature of it is what unlocks enhancements over email because there's diverse ways to achieve that... PoW, payments, WoT can all work together
Email spam mitigation is largely a reputation of the provider, there's maybe a dozen providers now that can assure high deliver-ability... rolling your own is doable but wildly impractical for individuals, and that's still subject to DNS registry etc.
A key that can use any number of relays at any time breaks down a bunch of walls, then there's meta-protocols that can go on top of that... your Lightning Pub in that example already has its own email account :)
I once said
Glad someone is taking time to explore this, will have to check out the client, direct messaging or mailing lists are a much more straightforward way to use nostr than twitter clones.... and email has just as many if not more problems than centralized social networks
NIP-65 moves it in this direction but my stats show its got relatively little uptake and only a handful of relays cover most of the people that have it configured anyway
NIP-17 on the other hand is privacy larp that works against it, need to investigate how an nmail server might deal with it