SpamAssassin / hashcash deployment stats?

Hi

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.

Adam