[hashcash] Re: SpamAssassin / hashcash deployment stats?

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Eric S. Johansson writes:
> Adam Back wrote:
> > Forwarding a question from Jeffrey Hantin:
> > 
> >> I'm trying to sell the idea of adding hashcash stamps to
> >> purchase-related notification email here but I'm getting some static
> >> from management since apparently they've never heard of it.  Any
> >> idea if the huge portals (AOL, MSN, Yahoo, GMail) and huge ISPs
> >> (Comcast, Earthlink, SBC, Cox, Bell South, Charter) will recognize
> >> hashcash stamps?
> > 
> > Is hashcash recognition turned on by default in SpamAssassin?
> > 
> > Are there any stats or estimates of the percentage of email gets
> > delivered thru SpamAssassin?
> > 
> > 
> > btw As I said to Jeffrey in email, I think the application seems like
> > is a great idea as its a common problem that your receipt after buying
> > something online doesn't arrive and its because your spam filter ate
> > it.  Its also a nuisance for the company becuase then you call them up
> > and waste their time trying to get confirmation of purchase.
> > 
> 
> the last time I spoke with Justin about this (and I'm sure he will 
> correct me if I'm wrong) is that spamassassin had hashcash turned on by 
> default but it was set up to modify your score instead of a pass/fail 
> test.  The bigger the stamp, the bigger the positive score.  the Spam 
> assassin scoring model makes it possible for a stamped message to be 
> considered spam.  On the other hand, you can always make a bigger stamp.

Yep, that's the case.

Also worth noting that most users will not have it set up by default;
it requires a line of configuration (to tell it what stamp addresses 
you expect to receive stamps for).

- --j.
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