（新浪VIP邮箱邮件不正常通信公告截图）

（万网企业邮局海外邮件通信公告截图）

（TOM国际电邮通信问题公告截图）

所有邮件服务商碰到的问题都是同样的：

①、国内邮箱给国外域发信收到退信，退信提示“Remote host said: 551 User not local; please try <forward-path>”  
②、国内邮箱用户给国外域发信，对方收到邮件时内容均为“aaazzzaaazzz”。 ③、国内邮箱给国外域发信收到退信，退信提示“Connected to ***.***.***.*** but connection died. (#4.4.2)” 
 ④、国外域给国内邮箱发信时收到退信，退信提示“Remote host said: 551 User not local; please try <forward-path>”  
⑤、国外域给国内邮箱发信后，新浪VIP邮箱用户收到的邮件内容均为“aaazzzaaazzz”。 

邮件内容截图

出现这些问题是因为国家防火墙对电子邮件的拦截监控，中国网民称此为“”有中国特色的SMTP现象“。

为了证实国家防火墙的监控阻止电子邮件发送的说法是否属实，我们进行了以下的测试：（注：域名和IP信息有修改）

从sales2@test.com（在大陆）发给construction@recipient.com（香港分公司）,在发件人的服务器查到如下日志：

   Oct 12 10:43:37 localhost postfix/smtpd[30005]: E50DD4187A5: client=unknown[125.0.0.1], sasl_method=LOGIN, sasl_username=sales2@test.com

   Oct 12 10:43:43 localhost postfix/cleanup[28691]: E50DD4187A5: message-id=<20061012024337.E50DD4187A5@slave.mail51.cn4e.com>

   Oct 12 10:43:44 localhost postfix/qmgr[17170]: E50DD4187A5: from=<sales2@test.com>, size=36652, nrcpt=2 (queue active)

   Oct 12 10:48:53 localhost postfix/smtp[1140]: E50DD4187A5: to=<construction@recipient.com>, relay=202.67.0.1[202.67.0.1], delay=316, status=deferred (conversation with 202.67.0.1[202.67.0.1] timed out while sending MAIL FROM)

   Oct 12 11:43:20 localhost postfix/qmgr[17170]: E50DD4187A5: from=<sales2@test.com>, size=36652, nrcpt=2 (queue active)

   Oct 12 11:43:30 localhost postfix/smtp[28474]: E50DD4187A5: to=<construction@recipient.com>, relay=202.67.0.1[202.67.0.1], delay=3593, status=deferred (lost connection with 202.67.0.1[202.67.0.1] while sending message body)

   Oct 12 13:43:20 localhost postfix/qmgr[17170]: E50DD4187A5: from=<sales2@test.com>, size=36652, nrcpt=2 (queue active)

   Oct 12 13:43:22 localhost postfix/smtp[5424]: E50DD4187A5: to=<construction@recipient.com>, relay=202.67.0.1[202.67.0.1], delay=10785, status=bounced (host 202.67.0.1[202.67.0.1] said: 500 error (in reply to MAIL FROM command))

   Oct 12 13:45:22 localhost postfix/qmgr[17170]: E50DD4187A5: removed

   发件人sales2@test.com收到退信：

   <construction@recipient.com>: host 202.67.0.1[202.67.0.1]

       said: 500 error (in reply to MAIL FROM command)

   在香港分公司查到如下日志：

   Oct 12 10:44:45 hk postfix/smtpd[21468]: 3BCDC2B000F: client=unknown[218.85.0.1]

   Oct 12 10:44:45 hk postfix/cleanup[22131]: 3BCDC2B000F: message-id=<20061012020145.3BCDC2B000F@hk.com>

   Oct 12 10:44:45 hk postfix/qmgr[25450]: 3BCDC2B000F: from=<sales2@test.com>, size=475, nrcpt=2 (queue active)

   Oct 12 10:44:53 hk postfix/smtp[22352]: 3BCDC2B000F: to=<construction@recipient.com>, relay=maildrop, delay=8, status=sent (recipient.com)

   Oct 12 10:44:53 hk postfix/qmgr[25450]: 3BCDC2B000F: removed

   说明这封信已经成功发过去了，但是为什么发件人会收到退信呢？退信是从那来的呢？对比一下这两条日志：

   Oct 12 10:43:44 localhost postfix/qmgr[17170]: E50DD4187A5: from=<sales2@test.com>, size=36652, nrcpt=2 (queue active)  (在发件人服务器上的日志）

   Oct 12 10:44:45 hk postfix/qmgr[25450]: 3BCDC2B000F: from=<sales2@test.com>, size=475, nrcpt=2 (queue active)  (香港收件服务器上的日志）

   发件人发送的时候size=36652,而到了香港却被变成了size=475！再看一下construction@recipient.com收到的这封信的内容竟然是aaazzzaaazzzaaazzzaaazzzaaazzz：

   Return-Path: <sales2@test.com>

   Delivered-To: construction@recipient.com

   Received: by mail.hk.com (202.67.0.1) (Postfix, from userid 12346)

           id 3BCDC2B000F; Thu, 12 Oct 2006 10:44:53 +0800 (CST)

   X-filter: Passed

   Received: from unkoown (218.85.0.1)

           by mail.test.com (Postfix) with ESMTP id E50DD4187A5

           for <construction@recipient.com>; Thu, 12 Oct 2006 10:43:56 +0800 (CST)

   Message-Id: <20061012020145.3BCDC2B000F@hk.com>

   Date: Thu, 12 Oct 2006 10:44:45 +0800 (HKT)

   From: sales2@test.com

   To: undisclosed-recipients:; 

   aaazzzaaazzzaaazzzaaazzzaaazzz 

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