RPOW - Reusable Proofs of Work

Hal Finney hal at finney.org
Fri Aug 20 17:09:24 EDT 2004

Matt Crawford writes:
> If you think of POW as a possible SPAM mitigation, how does the first 
> receiving MTA assure the next MTA in line that a message was "paid 
> for?"  Certainly the mail relay doesn't want to do new work, but the 
> second MTA doesn't know that the first isn't a spambot.

The first MTA would exchange the received RPOW for a new one of equal
value, and pass it along with the message to the next MTA in line.


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