On Wed, 15 Dec 2004, Alan J. Flavell wrote:
>
> There appear to be some MTAs which have some kind of rate-limit
> mechanism. I can't prove this conclusively, but it seems that the
> more that we try callout to them, the less likely they are to respond
> within the timeout that we set for callout. Which means that we
> defer, [...]
I've found that defer_ok is pretty much required for callouts to be
usable. Without it you end up losing too much desirable email from
incompetently configured web servers. The disadvantage of this is that
it's often incompetent web servers which are the sources of spam (e.g.
because of exploitable formmail scripts). So perhaps this kind of callout
failure would be worth an extra SpamAssassin point, but it causes too much
trouble to propagate the result into an SMTP error.
Tony.
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