----- Original Message -----
From: "Chris Drake" <christopher(_at_)pobox(_dot_)com>
To: <spf-discuss(_at_)v2(_dot_)listbox(_dot_)com>
Sent: Wednesday, September 01, 2004 5:15 AM
Subject: Re[2]: [spf-discuss] Re: DEPLOY: SPF/Sender ID support in Courier.
NKG> Almost all "hashcash" authors are very excited about the cost of
NKG> having a "sender pays" system... [snip] . Unfortunately, they're
NKG> almost all intertwined with a challenge-response [snip]
I understand SpamAssassin recognizes a variety of these schemes already.
Yes, headers that claim to be the haiku and various hashcash results have so
far turned out to correlate quite well with actually being spam.