Date: Tue, 27 Jul 2004 00:26:11 -0700 From: Pat Lashley <patl+freebsd@volant.org> To: Richard Kuhns <rjk@wintek.com>, freebsd-isp@freebsd.org Subject: Re: Question about virus/spam filtering for customers with mail servers Message-ID: <1925363520.1090913171@mccaffrey.phoenix.volant.org> In-Reply-To: <41056580.3050007@wintek.com> References: <41056580.3050007@wintek.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--On Monday, July 26, 2004 15:11:44 -0500 Richard Kuhns <rjk@wintek.com> 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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1925363520.1090913171>