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

From: Scott Blaydes (sblaydes_at_wtconnect.com)
Date: 07/26/04

  • Next message: Scott Lambert: "Re: Question about virus/spam filtering for customers with mail servers" 
    Date: Mon, 26 Jul 2004 15:36:11 -0500
To: Richard Kuhns <rjk@wintek.com>, freebsd-isp@freebsd.org

    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).

    You could set up your FreeBSD boxes that are doing the
    scanning/filtering to be the primary and secondary MX for the domain and
      then use sendmail's mailertable to deliever the messages to the
    customers' servers. The mailertable will even let you ignore MX
    settings for the domain.

    Scott Blaydes
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