The point is not the zombies attacking the crypto. The point is
zombies (ab)using their machines' legitimate owners' epostage.
This is a problem why?
Because it means epostage won't help: it'll just mean that abused
machines' owners pay in yet another way. (If epostage is expensive
enough, it may help a little in that it may slightly reduce the
compromise rate, but I think more likely it will result in pressure
against epostage.)
Making ePostage work is clearly possible in an environment of [...]
Quite possibly. Are such environments common enough to matter?
I can imagine them... Why couldn't they be common?
I don't know. But deployed epostage seems to be remarkably rare, so
_something_ is preventing its uptake; either your idea of how common
such environments are is way high or there's something else preventing
deployment despite what appears to be an open-and-shut case in favour.
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