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- iRedMail 版本号：0.7.4
- 使用哪个数据库存储用户帐号（OpenLDAP，MySQL，PostgreSQL）：
- 使用的 Linux/BSD 发行版名称及版本号：CentOS 5.6
- 与您的问题相关的日志信息：通过webmail发送邮件到某些邮箱（如QQ.com）会直接收到退信，但是使用客户端通过smtp发送，邮件可以正常收到，退信内容如下

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This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

       448267953@qq.com

Reporting-MTA: dns;mail1.kimark.com.cn
Received-From-MTA: dns;mail.bccsf.com.cn
Arrival-Date: Thu, 20 Jun 2013 10:29:36 +0800

Original-Recipient: rfc822;448267953@qq.com
Final-Recipient: rfc822;448267953@qq.com
Action: failed
Status: 5.6.1
Diagnostic-Code: smtp;554 5.6.1 Body type not supported by Remote Host
Received: from mail.bccsf.com.cn ([221.133.227.245]) by mail1.kimark.com.cn with Microsoft SMTPSVC(6.0.3790.4675);
     Thu, 20 Jun 2013 10:29:36 +0800
Received: from mail.bccsf.com.cn (mail.bccsf.com.cn [127.0.0.1])
    by mail.bccsf.com.cn (Postfix) with ESMTPA id BE5926CE579
    for <448267953@qq.com>; Thu, 20 Jun 2013 10:26:58 +0800 (CST)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8;
format=flowed
Content-Transfer-Encoding: 8bit
Date: Thu, 20 Jun 2013 10:26:58 +0800
From: kenny@bccsf.com.cn
To: <448267953@qq.com>
Subject: Fwd: =?UTF-8?Q?=E5=9B=9E=E5=A4=8D=EF=BC=9A=36=31=32=37=35-?=
=?UTF-8?Q?=E4=B8=AD=E5=BB=BA=E6=9D=90=E9=92=A2=E9=93=81=EF=BC=88=E4=B8=8A?=
=?UTF-8?Q?=E6=B5=B7=EF=BC=89=E6=9C=89=E9=99=90=E5=85=AC=E5=8F=B8-=32=30?=
=?UTF-8?Q?=31=33=30=36=E6=B8=85=E5=8D=95?=
Message-ID: <ff0c8e34530ac20a613797528fab0e97@bccsf.com.cn>
X-Sender: kenny@bccsf.com.cn
User-Agent: RoundCube WebMail
Return-Path: kenny@bccsf.com.cn
X-OriginalArrivalTime: 20 Jun 2013 02:29:36.0603 (UTC) FILETIME=[01DE6AB0:01CE6D5E]