HC - Cut down on email spam by proving some amount of work was done to send the message to the receiver.

Zap Stamp - Like a black list/white list on an email filter, but the threshold to post for any replying/commenting npub is “x amount of sats”.

For someone like Roya, all npubs would be prevented from replying without putting up the “zap stamp” fee (the amount of sats Roya receives before a reply/comment can be published to her original note) UNTIL an npub is added to an approved posting list that waives the fee (this list would remain small because it is one she manages as her own web of trust).

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This may be too complex right now with zaps being a tad buggy in the sense that clients are doing zaps/wallets in different ways.