[15967] in cryptography@c2.net mail archive
Re: RPOW - Reusable Proofs of Work
daemon@ATHENA.MIT.EDU ("Hal Finney")
Sat Aug 21 15:45:56 2004
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
To: crawdad@fnal.gov, cryptography@metzdowd.com
Date: Fri, 20 Aug 2004 14:09:24 -0700 (PDT)
From: hal@finney.org ("Hal Finney")
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.
Hal
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