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A comment on Show HN: Veropost – Charge people to send you email. Parent comment

Re:Show HN: Veropost – Charge people to send you email by tuxxy on Thursday April 06, 2017 @10:04AM (#14050573)
Something like this was already done with hashcash.

https://en.wikipedia.org/wiki/Hashcash

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Re:Show HN: Veropost – Charge people to send you email by jkbbwr on Thursday April 06, 2017 @06:25PM (#14055238)
Oh look. A good idea.
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