Hi
>> we use callbacks on a similar way, we do not do the callback
>> if the incoming mail passes spf, dkim is not used to prevent
>> callbacks because we do callbacks at RCPT time and dkim needs
>> to reach DATA, we also use whitelisting to prevent callouts too
>
> Can I ask why you don't do the call backs in DATA then? If I were to use
> callbacks, personally I'd want to make sure they were run at the very
> end of my spam filtering to reduce the likelyhood of my server being
> listed on an RBL for backscatter...
it takes less resouces to do the callback at rcpt than at the very
end of the spam filtering (but we do callouts at the end of all
rcpt checks). You can reduce the chance to get listed on a RBL by
using spf, whitelists, etc .. (calloouts also have it's own cache)
we have been using callouts since they exist without ever being
blacklisted
--
Best regards ...
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David Saez Padros http://www.ols.es
On-Line Services 2000 S.L. telf +34 902 50 29 75
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