Jonathan Morton wrote:
The only negative thing I can come up with at the moment is that it requires an SMTP-protocol update in order to work.
Which, unfortunately, is a very large point against it. Namely, it appears to require all legitimate senders to update their MTAs to support the newly modified protocol. Therefore, you might as well replace SMTP wholesale, which we already know isn't going to happen.
Yes, I know that.
Another question worth asking is: What does it save versus checking hashcash after receiving the message? Bandwidth and a bit of storage is the answer, but neither of those are expensive resources in most of today's Internet (at the MTA level, not necessarily client level).
Jesper -- Jesper Krogh, jesper@xxxxxxxx, JabberID: jesper@xxxxxxxxxxxx
