bob(_at_)wyman(_dot_)us wrote:
I think you're being too extreme in your analysis here. Even if
the various systems you list are used, there is no reason (except for
challenge/response) that we need to assume that the failure of a system
to support one or another method would cause mail to be discarded.
I meant that such extreme systems would be too expensive to use
(time, effort, money, maintenance...)
A guiding principle is that the number of transactions goes down
exponentially with the cost of each transaction. This is why email is
so useful, and spam is so prevelent: email is near zero-cost.
The anti-spam solutions should be focussing on increasing the costs
of the behaviour which spammers use, and non-spammers don't.
Alan DeKok.
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