[Dovecot] what best for anti-spam filter?

[Emmanuel Dreyfus]

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. 

-- 
Emmanuel Dreyfus
manu at netbsd.org