From owner-freebsd-isp@FreeBSD.ORG Thu Nov 22 09:52:35 2007 Return-Path: Delivered-To: freebsd-isp@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E3D2516A477 for ; Thu, 22 Nov 2007 09:52:34 +0000 (UTC) (envelope-from mjsotn@gmail.com) Received: from wa-out-1112.google.com (wa-out-1112.google.com [209.85.146.177]) by mx1.freebsd.org (Postfix) with ESMTP id B113213C4F0 for ; Thu, 22 Nov 2007 09:52:33 +0000 (UTC) (envelope-from mjsotn@gmail.com) Received: by wa-out-1112.google.com with SMTP id k17so3267766waf for ; Thu, 22 Nov 2007 01:52:24 -0800 (PST) Received: by 10.114.168.1 with SMTP id q1mr1992864wae.1195707504221; Wed, 21 Nov 2007 20:58:24 -0800 (PST) Received: from mjspcbook ( [203.13.70.60]) by mx.google.com with ESMTPS id k23sm657190waf.2007.11.21.20.58.21 (version=SSLv3 cipher=RC4-MD5); Wed, 21 Nov 2007 20:58:23 -0800 (PST) Message-ID: <00c401c82cc4$5bcd6a20$580116ac@mjspcbook> From: "Mitchell Smith" To: Date: Thu, 22 Nov 2007 14:58:37 +1000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: Spam Filter Efficiency X-BeenThere: freebsd-isp@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Internet Services Providers List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Nov 2007 09:52:35 -0000 Greetings List, I apologize if this topic has already been raised, however I would like = some feedback on how people are managing spam in high volume email = environments. To give you a little background, our organization currently has three = reasonably powerful boxes (dual XEON with 4GB ram), processing about = 800000 messages a day (total) and are seriously struggling under the load. Our configuration consists of Postfix with a couple of RBL checks, GLD = greylisting (central MySQL db), which falls through to MailScanner which = filters with SpamAssassin / Clamav. >From the mail scanners, the emails are the forwarded (via an LDAP = lookup) to a specific Cyrus mail store. We have turned off DCC checks in SpamAssassin which has improved = performance quite a bit, however we are still doing Razor checks. We have investigated a couple of commercial solutions which clamed to be = able to handle more than our quantity of mail on one box, however the = spectacular pricetags associated with such solutions suggest we won't be moving = forward with these any time soon. We are also looking at other open source solutions such as amavis / = dspam to see if we can try and improve the throughput on our current = hardware. What I would like some feedback on is if anyone has already gone down = this path and found one solution that performs better than another, or = if anyone is using a similar setup to ours and has found better ways to optimise it. I would very much appreciate some feedback either on or off list please, = as to how other people might be tackling this same problem. Cheers