Re: [AMaViS-user] Maximum message size to scan

I have been using 512 * 1024 for months (9 or more) on every system I
have built. These systems are no powerhouse machines - they have 512MB
RAM and a PIII processor (450-500MHz).

My systems process an average of 300,000-400,000 message attempts per
month, and CPU cycles are never an issue. I see only about 22% of all
message attempts actually make it through my systems without being
quarantined, almost never get false positives (except for messages
rejected because the remote server isn't configured properly), and
flat-out reject about 35% of attempts at the "front door" (they're
never allowed in).

HOWEVER: I also use a lot of regular expressions with my mail server
software (postfix) to weed out the obvious junk, and also use a lot of
different Real-Time Block Lists to prevent unwanted client connections
in the first place.

So, the messages that make it to Amavis are often able to be scanned
very quickly and pass right through without issue.

--- Mark Martinec <Mark.Martinec+amavis@ijs.si> wrote:

> Martin,
>
> > I have seen a couple of spams bypass our spamassassin scan because
> they
> > are larger than the 200KB default $sa_mail_body_size_limit. I'm
> thinking
> > about raising that limit to 512KB. If anyone have raised it, what
> size
> > have you configured it to? Has it done a huge impact on the load?
>
> You can try. The CPU time consumed by SA regexp rules goes linearly
> with mail size, so if you can afford it, and you are seeing larger
> spam
> messages, increase the limit somewhat - e.g. to the largest spam size
> that came through recently.
>
> Mark
>
>
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