永久投递错误,帮我看一下是什么原因

piree

Fri 2007-04-06 10:10:56: 正在进行[***.co.in]的 MX-记录解析（DNS 服务器：***.***.***.***）...
Fri 2007-04-06 10:11:05: *  错误：等候 DNS 响应 10 秒时间已到（尝试第 1 次，共 3 次）
Fri 2007-04-06 10:11:05: 正在进行[***.co.in]的 MX-记录解析（DNS 服务器：***.***.***.***）...
Fri 2007-04-06 10:11:05: *  P=000 D=***.co.in TTL=(55) MX=[***.co.in] {***.***.***.***}
Fri 2007-04-06 10:11:05: Attempting MX: P=000 D=***.co.in TTL=(55) MX=[tyrolit.co.in] {***.***.***.***}
Fri 2007-04-06 10:11:05: 试图 SMTP 连接到 [***.***.***.*** : 25]
Fri 2007-04-06 10:11:05: 等候连接...
Fri 2007-04-06 10:11:05: 已建立连接 (***.***.0.2 : 4213 -> ***.***.***.151 : 25)
Fri 2007-04-06 10:11:05: 等待协议初始化...
Fri 2007-04-06 10:11:07: <-- 220-cpanel3.interactivedns.com ESMTP Exim 4.63 #1 Fri, 06 Apr 2007 07:34:56 +0530
Fri 2007-04-06 10:11:07: <-- 220-We do not authorize the use of this system to transport unsolicited,
Fri 2007-04-06 10:11:07: <-- 220 and/or bulk e-mail.
Fri 2007-04-06 10:11:07: --> EHLO ***.com.cn
Fri 2007-04-06 10:11:10: <-- 250-cpanel3.interactivedns.com Hello ***.com.cn [***.***.***.242]
Fri 2007-04-06 10:11:10: <-- 250-SIZE 52428800
Fri 2007-04-06 10:11:10: <-- 250-PIPELINING
Fri 2007-04-06 10:11:10: <-- 250-AUTH PLAIN LOGIN
Fri 2007-04-06 10:11:10: <-- 250-STARTTLS
Fri 2007-04-06 10:11:10: <-- 250 HELP
Fri 2007-04-06 10:11:10: --> MAIL From:<[email=mis@***.com.cn]mis@***.com.cn[/email]> SIZE=1678
Fri 2007-04-06 10:11:10: <-- 250 OK

piree

已经连接上,也解析成功

下面的这段不明白了~~

请高手帮忙说明一下,这个永久投递错误是什么原因?