https://bugs.exim.org/show_bug.cgi?id=2147
--- Comment #8 from Jeremy Harris <jgh146exb@???> ---
No, but try 2137.
> Obviously, the random callout is supposed to just be an optimisation, to avoid
callouts for subsequent specific localparts.
Not quite. It's to find out whether the target gives reliable information
at RCPT time, or just accepts everything blindly. Certainly it'll have the
effect you describe, should blind-acceptance be discovered - but that only
tells
us that attempting to do callout verification is pointless. It'll result in us
later spending resources on an actual message transmission, which is hardly an
optimisation.
> We should never defer the
> acceptance of *this* localpart, just because the random callout got a 4xx
> response.
I disagree.
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