[Dovecot] what best for anti-spam filter? [greylisting]

[Andrzej A. Filip]

On 07/24/2012 11:45 AM, Emmanuel Dreyfus wrote:
> On Tue, Jul 24, 2012 at 03:38:00AM -0500, Stan Hoeppner wrote:
>> Greylisting only stops bots.  It is resource intensive, and causes
>> delivery delays.  There exist bot spam killing solutions that are just
>> as effective, with less downside.  Two are Postfix' postscreen daemon,
>> and fqrdns.pcre, which rejects based on consumer/dynamic looking rDNS.
> I use that in order to decide the greylisting delay: suspect IP get a
> 12 hours greylist, everyone else gets 15 mn, or 0 if whitelisted by 
> recipeients. It works quite well. 
Have you considered using some dnswl (whitelist) to turn off greylisting
for some hosts?
e.g. dnswl.org. Greylisting for dnswl.org "none" level (the lowest
trust) makes (some) sense only if you use bulk detectors like
razor/pyzor/DCC.