Henrik K schrieb am Monday, den 29. December 2008:

> On Mon, Dec 29, 2008 at 06:54:52PM +0100, Alexander Wirt wrote:
> > > Using amavisd-milter is much better option, you can control concurrent
> > > process amount and socket queue. No limiting then needed for postfix
> > > processes, you can do do cheap rejects before amavisd (unknown users,
> > > helo/rbl etc).
> > > 
> > > Of course you do have to know something about your average traffic and
> > > hardware limits. But nothing wrong about running pre-queue scanning.
> >
> > Sure. But about doing full bloated SA and Virusscanning in pre-queue. You 
> > can
> > do wonderful denial of service attacks with such mail systems :). 
> 
> What do you think happens when after-queue scanner is flooded with millions
> of DoS mails? It will start crawling just the same. Only difference is where
> your mail is jammed, your disk or sending mail servers.
> 
> :):)
Ehm no. I can decide to stuff with the mail, do some priorisation. But I have
the mail. Which is a big difference to "the mail is lost in somebody else
queue". 

> 
> > Do cheap things at pre-queue time (header checks, helo...) and the bloated,
> > expensive things after queue. 
> 
> Only if you are seriously underpowered.
No. At least not from my experience as a mail administrator.

Alex



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