Re: virus mail ignores MX?

["Monty Ree" <chulmin2 () hotmail com>]

Thank you for all your kind advice.

But I have additional questioons.

1. 
"set up your viruswall to relay the messages to the IP of mail.xxxxx.com."
--> I have used sendmail for viruswall, and how can I setup sendmail to 
relay some ip?

2. all said that I should set virus filtering module at mail server 
directly wihtout any MX,
if then, virus module may cause some load to mail server, I guess. right?


3.  in the point of the virus code, 
MX record calculation in DNS would increase the size of the virus code?
But I think MX calculation is not the virus code side, but DNS side.
So MX ignorance can cause increase the size of the code, I think, right?



Thanks for your kind answer again.

From: "Paul Kurczaba" <paul () myipis com>
To: "Monty Ree" <chulmin2 () hotmail com>,<security-basics () securityfocus com>
Subject: Re: virus mail ignores MX?
Date: Sun, 13 Jun 2004 20:46:35 -0400

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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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 
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