filter warning mail

Hi. This is the smtp delivery program
I wasn't able to deliver the message. 

The message has been filtered that you send to 



delivery failure: the message's content-type (Content-Type: audio/x-wav) matches the pattern string (Pattern: audio/x-wav)

--- Below this line is a copy of the message.

Received: from gongkong.com ([61.29.180.45])
	(envelope-sender <>)
	by 59.151.1.71 with ESMTP
	for <>; Tue, 08 Nov 2005 19:54:41 +0800
From: 
To: 
Subject: Mail Delivery (failure )
Date: Tue, 8 Nov 2005 20:03:17 +0800
MIME-Version: 1.0
Content-Type: multipart/related;
	type="multipart/alternative";
	boundary="----=_NextPart_000_001B_01C0CA80.6B015D10"
X-Priority: 3
X-MSMail-Priority: Normal