Question about virus/spam filtering for customers with mail servers

From: Richard Kuhns (rjk_at_wintek.com)
Date: 07/26/04

  • Next message: Bob Martin: "Re: Question about virus/spam filtering for customers with mail servers" 
    Date: Mon, 26 Jul 2004 15:11:44 -0500
To: freebsd-isp@freebsd.org

    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...
            - Rich 

    -- 
Richard Kuhns                   Wintek Corporation
E-mail: rjk@wintek.com          427 N 6th Street
Tel: +1 (765) 742-8428          Lafayette, IN 47901-1126
Fax: +1 (765) 742-0646          United States of America
_______________________________________________
freebsd-isp@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-isp
To unsubscribe, send any mail to "freebsd-isp-unsubscribe@freebsd.org"
  • Next message: Bob Martin: "Re: Question about virus/spam filtering for customers with mail servers"

    Relevant Pages

    • Re: Any recomendations on C/R spam tools for Debian
      ... > I plan to setup a Mail Server for a customer and was planing to use ...
      (Debian-User)
    • Re: Delivery Failure
      ... firewall do any SMTP inspection, such as a Cisco PIX does with its mailguard ... gets sent back to the client and my customer does not recieve the email. ... report says the email failed because it lost connection with (mail server ...
      (microsoft.public.exchange.admin)
    • IIS, SMTP, and DNS resolution
      ... This domain is of a customer that is ... entry to point to the inside address of their mail server. ... system is still attempting to resolve DNS for this domain via our DNS ... the name of the mail server and it seems to use the hosts entry fine, ...
      (microsoft.public.inetserver.iis.smtp_nntp)
    • Re: Any recomendations on C/R spam tools for Debian
      ... > I plan to setup a Mail Server for a customer and was planing to use Debian as ...
      (Debian-User)
    • Re: Question about virus/spam filtering for customers with mail servers
      ... > We offer virus/spam filtering for customers with their own mail servers. ... > under FreeBSD 4), and the customer's MX records point to their server ... > the secondary mail server. ...
      (freebsd-isp)