谢谢你的答复。
1.exchange版本为2007.
2.单独发的测试邮件和第二次发同一封邮件没有问题
3.没有关于此地址的transport role
4.请参考一下部分internet header（修改了实际地址）
Received: from two.com (121.y.y.y) by
mail.two.com (x.x.x.x) with Microsoft SMTP Server id
8.3.137.0; Thu, 13 Feb 2014 11:20:04 +0800
Received: Thu, 13 Feb 2014 11:19:43 +0800
Date: Thu, 13 Feb 2014 11:19:42 +0800
Organization: =?GB2312?B?xM+3vbXn19O/2rC2?=
From: =?GB2312?B?vLzK9dans9Y=?= <c@one.com>
To: Man.One <1@two.com>, Yuk.Du <2@two.com>,
=?GB2312?B?y8664w==?= <3@two.com>, =?GB2312?B?wO6y+vfr?=
<a@one.com>, =?GB2312?B?wfXB4Q==?= <b@one.com>,
=?GB2312?B?zfW7t9Pu?= <d@one.com>
CC: =?GB2312?B?vLzK9dans9Y=?= <c@one.com>
Subject: =?GB2312?B?sunR6da4we7Oyszi?=
X-Priority: 3
X-Has-Attach: no
X-Mailer: Foxmail 7, 1, 3, 52[cn]
MIME-Version: 1.0
Message-ID: <2014021311194205005910@one.com>
Content-Type: multipart/related;
boundary="----=_001_NextPart855515725444_=----"
Return-Path: 1@two.com
.
.
.
X-MS-Exchange-Organization-Antispam-Report:
DV:3.3.13411.467;SV:3.3.4604.600;SID:SenderIDStatus
None;OrigIP:121.y.y.y
