Henrik K a écrit :
> On Mon, Dec 29, 2008 at 12:15:22PM -0500, Michael Scheidell wrote:
>>> Hello,
>>>
>>> before i was using amavis in post-queue mode.
>>> But due to german law, i must use amavis in pre-queue mode.
>>> How can i accelerate amavis, to use it in pre-queue mode?
>>> \
>> Just curious:
>>
>> What is english translation of german law, something like
>> "You must use amabisd-new in pre-queue mode under penalty of law"?
>>
>> Since amavisd-new in pre-queue mode is SLOW.... SLOW ... SLOW
> 
> What's all the fuss about SLOW SLOW BOOM BOOM it's gonna explode?
> 
> It's slow if you use smtpd_proxy_filter 

That's what I understood by pre-queue. vocabulary from the days before
milter support in postfix...

> and gazillion amavisd processes.
> Probably something like that is the case here..

or huge or slow SA rules.

> 
> Using amavisd-milter is much better option, you can control concurrent
> process amount and socket queue.

how?

if you configure postfix to accept 100 simultaneous connections, then
you should be prepared to filter 100 simultaneous messages (I am talking
pre-queue here).

but even assuming a single message. if the time it takes to scan is
long, the client may disconnect. I don't know if caching would help here
(so that next time, the message is filtered quickly).

Can you explain why -milter would be better than proxy_filter.

> No limiting then needed for postfix
> processes, you can do do cheap rejects before amavisd (unknown users,
> helo/rbl etc).
> 

Yes. That should be the first thing to do when setting up an anti-spam
server/relay/... etc.

> Of course you do have to know something about your average traffic and
> hardware limits. But nothing wrong about running pre-queue scanning.
> 


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