一用户通过在之前的邮件中直接回复的方式进行邮件群发，发送后，发现配置了pop3的同事接收下来的邮件为乱码，配置了Exchange的邮件可以正常接收。
环境：Email服务端 Exchange2010 SP1简体中文版， 客户端：Outlook 2007 简体中文版
乱码如下(部分)：
Received: from EXDAG2.suntakpcb.com ([fe80::e43c:a68b:10e3:54d2]) by
EXCAS1.suntakpcb.com ([::1]) with mapi id 14.01.0218.012; Thu, 8 May 2014
13:13:40 +0800
From: =?gb2312?B?1cXBvA==?= <lzhang@suntakpcb.com>
To: =?gb2312?B?J8W30fTmryc=?=
<IMCEAEX-_O=SUNTAKPCB_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+28FYDIBOHF23SPDLT+29_CN=RECIPIENTS_CN=USER289E0C21@suntakpcb.com>,
=?gb2312?B?s+e078mzvq6yybm6sr8=?= <CD-PUR@suntakpcb.com>,
=?gb2312?B?s+e078mzvq7Gt7Gjsr8=?= <CD-QA@suntakpcb.com>,
=?gb2312?B?s+e078mzvq7J6LG4sr8=?= <CD-Device@suntakpcb.com>,
=?gb2312?B?s+e078mzvq7J6LzGsr8=?= <CD-Design@suntakpcb.com>,
=?gb2312?B?s+e078mzvq7J87zGsr8=?= <CD-QA-Audit@suntakpcb.com>,
=?gb2312?B?s+e078mzvq7K0LOhsr8=?= <CD-QA-Market@suntakpcb.com>,
=?gb2312?B?s+e078mzvq7P+srbsr8=?= <CD-Sales@suntakpcb.com>,
=?gb2312?B?s+e078mzvq7Qxc+isr8=?= <CD-IT@suntakpcb.com>,
谢谢！