谁能帮我分析一下邮件的信息？

tita9109

问题：
邮件发给jingongsi@263.net 然后收到一封退信，退信的原始信息如下，包含邮件头、邮件内容和邮件附件内容。
查看过发信的内容，没有发给pingping520770@163.com，怎么退信时多了这么一个地址？哪位达人帮忙分析一下。谢谢！

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Delivered-To: yangg@greensport.cn
Received: (qmail 10183 invoked by uid 889);
  2 Aug 2008 09:21:12 +0800
Received: from unknown (HELO mta10.263.net) (211.150.96.30) by 0 with SMTP;
  2 Aug 2008 09:21:12 +0800
Received: by mta10.263.net (Postfix)id AECD91AC7ED;
  Sat,  2 Aug 2008 09:26:44 +0800 (CST)
Date: Sat,  2 Aug 2008 09:26:44 +0800 (CST)
From: MAILER-DAEMON@263.net (Mail Delivery System)
Subject: Undelivered Mail Returned to Sender
To: yangg@greensport.cn
MIME-Version: 1.0
Content-Type: multipart/report;
  report-type=delivery-status;
boundary="C5ED81AC7EC.1217640404/mta10.263.net"
Message-Id: <20080802012644.AECD91AC7ED@mta10.263.net>
X-UIDL: 1217640072.10186.email.eb.com.cn,S=21146
This is a multi-part message in MIME format.
--C5ED81AC7EC.1217640404/mta10.263.net           
Content-Description: Notification
Content-Type: text/plain                                          --注释：以下是退信的正文
This is the Postfix program at host mta10.263.net.
I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can
delete your own text from the message returned below.
   The Postfix program
<pingping520770@163.com>: host 163mx03.mxmail.netease.com[220.181.12.72] said:
    550 Invalid User: pingping520770@163.com
--C5ED81AC7EC.1217640404/mta10.263.net       --注释：以下是退信的错误报告
Content-Description: Delivery error report
Content-Type: message/delivery-status
Reporting-MTA: dns; mta10.263.net
Arrival-Date: Sat,  2 Aug 2008 09:26:43 +0800 (CST)
Final-Recipient: rfc822; pingping520770@163.com
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host 163mx03.mxmail.netease.com[220.181.12.72]
    said: 550 Invalid User: pingping520770@163.com
--C5ED81AC7EC.1217640404/mta10.263.net
Content-Description: Undelivered Message
Content-Type: message/rfc822
Received: by mta10.263.net (Postfix, from userid 500)id C5ED81AC7EC;
  Sat,  2 Aug 2008 09:26:43 +0800 (CST)
Delivered-To: jingongsi@263.net
Received: from mta8.263.net (mx03 [127.0.0.1])by mta7.263.net (Postfix) with ESMTP id 902661CD83DDfor <jingongsi@263.net>;
  Sat,  2 Aug 2008 09:26:51 +0800 (CST)
X-KSVirus-check: 0
X-SKE-CHECKED: 1
X-ABS-CHECKED: 1
Received: from mail3.eb.com.cn (mx03 [127.0.0.1])by mta8.263.net (Postfix) with ESMTP id 310301E2CACfor <jingongsi@263.net>;
  Sat,  2 Aug 2008 09:26:51 +0800 (CST)
X-SENDER-IP: 202.75.214.86
X-LOGIN-NAME:
X-ATTACHMENT-NUM: 2
X-SENDER: yangg@greensport.cn
X-DNS-TYPE: 1
Received: from mail3.eb.com.cn (mail3-cnc.eb.com.cn [202.75.214.86])by mta8.263.net (Postfix) whith ESMTP id 31053HC0HF9;
Sat, 02 Aug 2008 09:26:51 +0800 (CST)
Received: (qmail 10144 invoked by uid 889);
  2 Aug 2008 09:21:10 +0800
Received: from unknown (HELO server) ([email=yangg@greensport.cn@125.118.136.157]yangg@greensport.cn@125.118.136.157[/email]) by 0 with ESMTPA;
  2 Aug 2008 09:21:10 +0800
MIME-Version: 1.0
Date: Sat, 02 Aug 2008 09:21:53 +0800
From: "yangg" <yangg@greensport.cn>
Reply-To: "yangg" <yangg@greensport.cn>
To: =?gb2312?B?wqyx8w==?= <jingongsi@263.net>
Subject: =?gb2312?B?wqyzp7Okx+u4+M7SsajSu8/C1fvM17XE?=
=?gb2312?B?vNu48Q==?=
X-Mailer: HQ <www.hquan.com>
X-Priority: 0
Disposition-Notification-To: "yangg" <yangg@greensport.cn>
Content-Type: multipart/mixed;
boundary="-----_chilkat_926_70ca_01754276.5bb48810_.MIX"
Message-ID: <[email=CHILKAT-MID-4d45a63f-3ca3-37a3-90e8-0fb45bfd599c@server]CHILKAT-MID-4d45a63f-3ca3-37a3-90e8-0fb45bfd599c@server[/email]>
This is a multi-part message in MIME format.

tita9109

Arrival-Date: Sat,  2 Aug 2008 09:26:43 +0800 (CST)
Final-Recipient: rfc822; pingping520770@163.com  <--这儿怎么会冒出一个莫名其妙的邮箱？？？