--On 14 May 2009 12:50:19 +0100 Mike Cardwell <[email protected]> wrote:
> 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'd not be using any lumps of their resource if they used SPF, and gave you a fighting chance of recognising when email was coming from their system. -- Ian Eiloart IT Services, University of Sussex 01273-873148 x3148 For new support requests, see http://www.sussex.ac.uk/its/help/ -- ## 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/
