[Mimedefang] large systems

[John Scully]

You described our setup perfectly.  We only started moving traffic to
the filtering cluster a few days ago, but have already peaked to 400
messages per minute addressed to about 20,000 recipients during a spam
attack.

We use sendmail as an MTA only with a perl/mysql mail platform for
webmail and pop3.  We do several layers of virus scanning and MANY
levels of spam/porn filtering with full controls at the client and
subscriber level (we run 250 ISPs, so we need control points at the
domain as well as sub level).

I would strongly recommend using mysql, and designing the DB to have
many tables, broken down by the first two letters of the mailbox (i.e.
mailboxaa, mailboxab, mailboxac etc).  At anything up to several million
mailboxes this keeps the index to only one or two levels of redirection
and allows mysql to cache the more active mailboxes.  It makes the most
difference when under a sorted dictionary attack, because thousands of
hits in a row will go to the same small index.

You can contact me offline if you want more detail.

John Scully

-----Original Message-----
From: mimedefang-admin at lists.roaringpenguin.com
[mailto:mimedefang-admin at lists.roaringpenguin.com] On Behalf Of Cor
Sent: Saturday, September 27, 2003 9:12 AM
To: mimedefang at lists.roaringpenguin.com
Subject: [Mimedefang] large systems

Hi all, im evaluting the use of mimedefang in our organisation (an ISP
with
about 150.000 customers, about 100.000 of which are DSL). We handle a
few million emails a day. 

We currently do virus scanning with amavis/sophos and we have a homemade
RBL system. Everything must be user configurable (user choose to use 
virus and spam filtering). 

Im thinking of switching to mimedefang to integrate virus/spam filtering
(amavis cant do this as id like because the milter daemon doesnt have
the full protocol implemented). Id like to set up sophos/sophie, 
RBL, spamassassin, all conditional on whether the customer chose to use
any
of them. We could probably do this using either an SQL database or 
just a simple DB file generate from our customer database regularly.

As far as I can tell this should be doable. We have plenty of perl
wizards
internally so that shouldnt be a problem. Setting up a dozen or so
Dual 3ghz, 4GB memory, MFS spool, raid-1 HD boxes should also not be a
problem. 

Any comments on the feasability of this?

Thanks,

Cor

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