客户邮件无法发送到我们公司，直接收到退信

fishbig

退信内容如下，exchange跟踪记录中都没有对方记录，此问题上周一突然出现，之前几年一直很正常，会是什么原因？求解，多谢！

所附邮件有“暂时性”非致命投递错误。
--------------------------------------------------------------------------
这只是一则警告邮件 - 您不必重新发送邮件
--------------------------------------------------------------------------
MDaemon 配置为按设定的时间间隔自动
重试投递。后续投递该邮件的尝试正待处理。
Failed address: yu.heaton@ChinaPay.com
--- Session Transcript ---
Wed 2010-03-17 04:37:52: Parsing message <xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\pd90000024045.msg>
Wed 2010-03-17 04:37:52: *  From: xux@guoguang.com.cn  
Wed 2010-03-17 04:37:52: *  To: yu.heaton@ChinaPay.com  
Wed 2010-03-17 04:37:52: *  Subject: =?gb2312?B?tPC4tDog1tW2y7Go0N4=?=  
Wed 2010-03-17 04:37:52: *  Size (bytes): 39799  
Wed 2010-03-17 04:37:52: *  Message-ID: <000a01cac4e5$058ecd00$1f00a8c0@xux007>
Wed 2010-03-17 04:37:52: Attempting SMTP connection to [ChinaPay.com]  
Wed 2010-03-17 04:37:52: Resolving MX records for [ChinaPay.com] (DNS Server: 192.168.0.1)...
Wed 2010-03-17 04:37:52: *  P=010 S=000 D=ChinaPay.com TTL=(60) MX=[mail.chinapay.com] {112.65.***.***}  
Wed 2010-03-17 04:37:52: Attempting SMTP connection to [112.65.***.***:25]  
Wed 2010-03-17 04:37:52: Waiting for socket connection...
Wed 2010-03-17 04:37:52: *  Connection established (192.168.0.3:57759 -> 112.65.***.***:25)  
Wed 2010-03-17 04:37:52: Waiting for protocol to start...
Wed 2010-03-17 04:37:52: <-- 220 **********************************************************************************************************************************
Wed 2010-03-17 04:37:52: --> EHLO mail.guoguang.com.cn  
Wed 2010-03-17 04:37:52: <-- 250-mailserver2008.domain.chinapay.com Hello [61.132.***.***]  
Wed 2010-03-17 04:37:52: <-- 250-XXXA  
Wed 2010-03-17 04:37:52: <-- 250-SIZE  
Wed 2010-03-17 04:37:52: <-- 250-ETRN  
Wed 2010-03-17 04:37:52: <-- 250-PIPELINING  
Wed 2010-03-17 04:37:52: <-- 250-DSN  
Wed 2010-03-17 04:37:52: <-- 250-ENHANCEDSTATUSCODES  
Wed 2010-03-17 04:37:52: <-- 250-8bitmime  
Wed 2010-03-17 04:37:52: <-- 250-BINARYMIME  
Wed 2010-03-17 04:37:52: <-- 250-XXXXXXXB  
Wed 2010-03-17 04:37:52: <-- 250-VRFY  
Wed 2010-03-17 04:37:52: <-- 250-XXXXXXXXXXXXXXXXXXXXXXXC  
Wed 2010-03-17 04:37:52: <-- 250-XXXXXXXXXXXD  
Wed 2010-03-17 04:37:52: <-- 250-AUTH GSSAPI NTLM LOGIN  
Wed 2010-03-17 04:37:52: <-- 250-AUTH=LOGIN  
Wed 2010-03-17 04:37:52: <-- 250-XXXXXXXXXXXE  
Wed 2010-03-17 04:37:52: <-- 250-XXXXXXF  
Wed 2010-03-17 04:37:52: <-- 250 XG  
Wed 2010-03-17 04:37:52: --> MAIL From:<prvs=16918b1514=xux@guoguang.com.cn> SIZE=39799  
Wed 2010-03-17 04:37:52: <-- 250 2.1.0 prvs=16918b1514=xux@guoguang.com.cn....Sender OK  
Wed 2010-03-17 04:37:52: --> RCPT To:<yu.heaton@ChinaPay.com>  
Wed 2010-03-17 04:37:52: <-- 250 2.1.5 yu.heaton@ChinaPay.com  
Wed 2010-03-17 04:37:52: --> DATA  
Wed 2010-03-17 04:37:52: <-- 354 Start mail input; end with <CRLF>.<CRLF>  
Wed 2010-03-17 04:37:52: Sending <xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\pd90000024045.msg> to [112.65.***.***]  
Wed 2010-03-17 04:39:25: *  Winsock Error 10054 连接被另一端重置！
Wed 2010-03-17 04:39:25: 写入套接字错误
Wed 2010-03-17 04:39:25: 此邮件已经过了 0 天；还剩 1 天可投递

--- End Transcript ---

fishbig

求解、求帮助