From owner-freebsd-isp@FreeBSD.ORG Tue Jul 27 07:26:15 2004 Return-Path: Delivered-To: freebsd-isp@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id DE4CD16A4CE for ; Tue, 27 Jul 2004 07:26:15 +0000 (GMT) Received: from smtp.volant.org (gate.volant.org [207.111.218.246]) by mx1.FreeBSD.org (Postfix) with ESMTP id B729B43D2D for ; Tue, 27 Jul 2004 07:26:15 +0000 (GMT) (envelope-from patl+freebsd@volant.org) Received: from 64-144-229-193.client.dsl.net ([64.144.229.193] helo=[192.168.0.13]) by smtp.volant.org with asmtp (TLSv1:AES256-SHA:256) (Exim 4.34 (FreeBSD)) id 1BpMLf-000Py4-Kq; Tue, 27 Jul 2004 00:26:10 -0700 Date: Tue, 27 Jul 2004 00:26:11 -0700 From: Pat Lashley To: Richard Kuhns , freebsd-isp@freebsd.org Message-ID: <1925363520.1090913171@mccaffrey.phoenix.volant.org> In-Reply-To: <41056580.3050007@wintek.com> References: <41056580.3050007@wintek.com> X-Mailer: Mulberry/3.1.0 (Linux/x86) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Scan-Signature: 64c7c80b318715666ae22d0361d0eb9341283040 X-Spam-User: nobody X-Spam-Score: -4.9 (----) X-Spam-Score-Int: -48 X-Spam-Report: This mail has matched the spam-filter tests listed below. See http://spamassassin.org/tag/ for details about the specific tests reported. In general, the higher the number of total points, the more likely that it actually is spam. (The 'required' number of points listed below is the arbitrary number above which the message is normally considered spam.) Content analysis details: (-4.9 points total, 5.0 required) -4.9 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Subject: Re: Question about virus/spam filtering for customers with mail servers X-BeenThere: freebsd-isp@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Internet Services Providers List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Jul 2004 07:26:16 -0000 --On Monday, July 26, 2004 15:11:44 -0500 Richard Kuhns wrote: > I'm hoping someone will be willing to share a better way to handle this. > > We offer virus/spam filtering for customers with their own mail servers. > We're currently implementing this by configuring the customer's firewall > to only accept smtp connections from our servers (all running sendmail > under FreeBSD 4), and the customer's MX records point to their server > first and our server(s) second and third. In most cases this works just > fine -- attempts by a mail server to deliver mail directly to the customer > fail, the mail server tries the secondary MX site (us), we accept and > filter the message and deliver it to the customer (or not). > > Sometimes, though, there's a very long delay for messages to be delivered > - up to several days. In each case I've been able to track down, it's been > a Microsoft Exchange 2000 server that has issues with sending messages to > the secondary mail server. > > Does anyone have a good way we could use to list our server as the primary, > and then forward the messages? I've been going through the bat book, but > the indexing leaves a little to be desired and I haven't found anything > that looks applicable yet. > > Any suggestions would be greatly appreciated. Thanks in advance... If you're willing to abandon Sendmail, this sort of thing is trivial with Exim. -Pat