Agreed. We use sendmail, and check our DNSBL's their, it is much more efficient to use them before we ever engage SA. It is extremely rare to find an IP that lands on a reputable DNSBL and in those cases we can whitelist. Of course most of our traffic is B2B, not sure how effective this would be in B2C or C2C.
> On Jun 16, 2016, at 7:16 AM, jaso...@mail-central.com wrote: > > Fwiw, I've moved the DNSBL issue out of SA and put it 'in front' with > Postfix's postscreen. > > Instead of just *one* DNSBL, which is imo always a risk, I use multiple > dnsbls, and weight them in scoring. > > In my experience, it works fantastically well. > > A great write up on the approach is here > > http://rob0.nodns4.us/postscreen.html > > OF course, that presumes Postfix. You might me able to do the same with > other servers, or maybe don't have the option at all. > > Jason
