Please look it over and try to poke holes in it, but I've worked pretty
hard
to make it as bulletproof as possible.
You mention Exim and sender callback verification, it's probably
worth pointing out that this isn't default behaviour and the Exim docs
suggest that:
"This facility should be used with care, because it adds a lot of resource
usage to the cost of verifying an address."
Exim also provides a "callout_defer_ok" options to allow success in the
face of a temporary failure.
Whatever... any spam that *is* retried after the "block" is aged gets
through. Or have I got that wrong?
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