David Saez Padros wrote: >>> 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
You could argue that using N lumps of somebody elses resources is worse than using 10xN lumps of your own. Especially if the 10xN is going idle, which on many systems it is... > You can reduce the chance to get listed on a RBL by > using spf, whitelists, etc .. (calloouts also have it's own cache) True, that is an additional way to reduce the chance further. > we have been using callouts since they exist without ever being > blacklisted You don't want to advertise that fact on mailing lists like this, or your listing status might get changed. -- Mike Cardwell (https://secure.grepular.com/) (http://perlcv.com/) -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
