发给美国的一客户出现Winsock Error 10053错误

tideice

收发别的国内外邮件都算正常，但今天发现发给美国的一客户出现Winsock Error 10053错误，MTU也已经是1500的十进制数值了。（HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\在相对应的网卡中添加了MTU，数值是1500）应该没有错吧？已经重启过一次了。
发给这个客户的邮件依然还是10053的错误。具体如下：

Tue 2007-06-26 18:48:38: To: jyao@ftss.com
Tue 2007-06-26 18:48:38: Subject: Re: qotation
Tue 2007-06-26 18:48:38: Message-ID: <009601c7b7b8$9711a550$6900a8c0@kitty>
Tue 2007-06-26 18:48:38: MX-record resolution of [ftss.com] in progress (DNS Server: 192.168.0.1)...
Tue 2007-06-26 18:48:47: *  Error: 10 second wait for DNS response exceeded (attempt 1 of 10)
Tue 2007-06-26 18:48:47: MX-record resolution of [ftss.com] in progress (DNS Server: 211.167.97.67)...
Tue 2007-06-26 18:48:47: *  P=010 S=000 D=ftss.com TTL=(3086) MX=[mail.ftss.com] {209.69.36.78}
Tue 2007-06-26 18:48:47: Attempting MX: P=010 S=000 D=ftss.com TTL=(3086) MX=[mail.ftss.com] {209.69.36.78}
Tue 2007-06-26 18:48:47: Attempting SMTP connection to [209.69.36.78 : 25]
Tue 2007-06-26 18:48:47: Waiting for connection...
Tue 2007-06-26 18:48:48: Connection established (218.242.xxx.xxx : 1453 -> 209.69.36.78 : 25)
Tue 2007-06-26 18:48:48: Waiting for protocol initiation...
Tue 2007-06-26 18:48:48: Socket connection closed by the other side (how rude!)
Tue 2007-06-26 18:48:48: Winsock Error 10053 Connection abort.
Tue 2007-06-26 18:48:48: Connection closed
Tue 2007-06-26 18:48:48: This message is 4 minutes old; it has 56 minutes left in this queue
Tue 2007-06-26 18:48:48: SMTP session terminated (Bytes in/out: 0/0)

麻烦大家帮忙分析下问题在哪里？谢谢！

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