Jeroen Geilman put forth on 9/22/2010 5:06 PM:
>
> 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.
postfix with or without postscreen will go into stress-adaptive
mode: shorten timeouts and hang up after one "error" until the
surge passes. This is optional in Postfix 2.6 and default enabled
in Postfix 2.7.
postscreen blocks known and easy-to-detect zombies. Using built-in
mechanisms and a mix of good DNSBLs I have recently not received
any direct-from-zombie email. That will change as zombies (and
postscreen) evolve.
Wietse
