Re: virus mail ignores MX?

["Paul Kurczaba" <paul () myipis com>]

Remove the MX and A entry "mail.xxxxx.com" for your domain. This will force
all emails to hit your "viruswall.xxxxx.com" server. Then set up your
viruswall to relay the messages to the IP of mail.xxxxx.com.

Yes, it is true that some viruses ignore MX.

-Paul Kurczaba
----- Original Message ----- 
From: "Monty Ree" <chulmin2 () hotmail com>
To: <security-basics () securityfocus com>
Sent: Friday, June 11, 2004 4:41 AM
Subject: virus mail ignores MX?


> Hello, all.
>
> I have some question about virus mail.
> I have set viruswall about my domain and all mails should be sent first to
> viruswall.
>
> xxxxx.com.               86400   IN      MX      0 viruswall.xxxxx.com.
<-- 
> viruswall
> xxxxx.com.               86400   IN      MX      5 mail.xxxxx.com     <-- 
> mail server
>
> When I see virus mail header, like below.
>
> Received: from test.com ([211.117.47.1])
> by mail.xxxxx.com (8.11.6/8.11.6) with ESMTP id i5B8DdW02504
> for <chulmin2 () xxxxx com>; Fri, 11 Jun 2004 17:13:44 +0900
>
> some virus mails are filtered well at viruswall.
> but other virus mails are not get through viruswall,
> and go directly to mail.xxxxx.com. I think.
>
> so I think some virus mail ignores MX, right?
>
> What's the problem and how can I solve this problem?
>
>
> Thanks in advance.
>
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Ethical Hacking at the InfoSec Institute. Mention this ad and get $545 off 
any course! All of our class sizes are guaranteed to be 10 students or less 
to facilitate one-on-one interaction with one of our expert instructors. 
Attend a course taught by an expert instructor with years of in-the-field 
pen testing experience in our state of the art hacking lab. Master the skills 
of an Ethical Hacker to better assess the security of your organization. 
Visit us at: 
http://www.infosecinstitute.com/courses/ethical_hacking_training.html
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