Pseudo Nym on Nostr: Recall those greymail solutions where if an email came from an unknown to you sender, ...

Recall those greymail solutions where if an email came from an unknown to you sender, it was held and a response was sent to sender asking them to click a link to release it?

Worked reasonably well in its day, as spammers didn't have time to respond to their bulk emails.

How about one with a payment link. If I don't know you, pay me a buck to have me receive your email. If I actually want to talk to you, happily refunded.

Or even better "email reading as a service" $20 and I'll read your spam