On 09/22/2010 09:57 PM, Jay G. Scott wrote:
(at my site) spam arrives in big slugs. when a big
slug arrives sendmail will bog down--what wouldn't?
A properly configured postfix 2.7+ with postscreen wouldn't.
AFAIK your stated problem is exactly why postscreen was developed: to
keep known spammers (who are on RBLs and/or try to subvert the
protocols) away from the expensive smtpd daemon, and whitelist regular,
more trusted clients so they may bypass the stricter and slower
postscreen tests.
I don't know if anybody has run tests of this yet (it's still kinda
new), but it would be instructive to compare a "regular" postfix setup
(pre-postscreen) to a postscreen setup with fairly strict settings, with
respect to the load when a large spam dump hits.
--
J.
