Re: Question about virus/spam filtering for customers with mail servers

From: Pat Lashley (patl+freebsd_at_volant.org)
Date: 07/27/04

  • Next message: Bob Martin: "Re: Question about virus/spam filtering for customers with mail servers" 
    Date: Tue, 27 Jul 2004 00:26:11 -0700
To: Richard Kuhns <rjk@wintek.com>, freebsd-isp@freebsd.org

    --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
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  • Next message: Bob Martin: "Re: Question about virus/spam filtering for customers with mail servers"

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