"Dag Kihlman" <dag(_dot_)kihlman(_at_)htu(_dot_)se> wrote:
The failing of SMTP is that it allows the sender to cheat or lie. Any
authentication in SMTP is just authentication in an academic sense. In
reality spammers will hack even more than today and send using fully
authenticated mail servers.
Pull systems do not change this behaviour. See recent spammer
behaviour of hosting web sites on trojaned machines. They could just
as easily host mail for a "pull" system on the trojaned machine.
The benefits of a pull system are different. It allows recipients
to do things like wait 12 hours to pick up mail from unknown senders,
at which point the trojaned machine probably has a different IP, and
thus can't send the spam.
Alan DeKok.
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