virus mail ignores MX?

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

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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