Am 20. Dec, 2004 schwätzte Sanjay Darisi so:

> I need your opinion on spam filter and anti-virus packages for a
> high-volume email server. I'm inclined towards qmail. So, I need to
> install and setup good spam-filter and anti-virus packages, which
> I've no experience with so far. These should be capable of dealing
> with atleast 70,000 (average) emails a day. Ofcourse, most part of it
> is spam. I'm assuming qmail is capable of handling this. What is the
> maximum simultaneous smtp connections that qmail can handle anyway??

Depends on how much hardware you throw at it :).

I would suggest going with postfix rather than qmail if you don't have a
specific need for qmail. Does the debian install for qmail include the
mailer daemon redirect fix that djb refuses to accept?

http://www.usenix.org/events/lisa02/tech/mikula.html

Note: I believe all three authors are now happily no longer at telerama.

> The situation now is that there is a commercial Linux based spam-filter
> box that is being choked by this volume of emails. And we want to
> replace it with one of our own. So, I'm installing qmail on debian
> stable and looking for high-throughput spam-filter and anti-virus s/w
> for our server. If anybody here has experiences with such s/w, pls let
> me know.

You might need to go to testing for the anti-spam stuff. Luckily it
should finally go stable sometime in the next 5 years...  :)

I've moved to testing on almost all of my boxen now. I've recently
experienced some problems with GNOME upgrades, but otherwise they've all
been rock solid for a long time.

> I feel that as SpamAssasin is perl based spam-filter, wouldn't that
> hog CPU for this kind of load. It's a PIII 1.0G, 512MB RAM IBM based
> e-server. I feel any C language based spam filter would do a better job,
> wouldn't it??

I like spamassassin, but yeah it seems to need a lot of resources.

At least one person I know has claimed good success via bogofilter for
some high volume mail. He's also running debian.

Maybe what you can do is:

1. reject mail for non-existant email addies
2. filter with bogofilter
3. do anti-virus checks
4. use spamassassin and its learning bayesian databases
5. deliver

I just made up that sequence, so don't be surprised if there are problems
in getting it implemented :). I think I like it, though, so might start
putting it in place after the holidays. Well, except 3 because I don't
care about viruses.

Seach the list archives to references on clam-av. I've seen it mentioned
in, I think, good light, but generally ignore it because I see viruses as
just another form of spam and want my spam filters to get the viruses.

ciao,

der.hans
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