奇怪的错误退信信息

job21

公司内部互发，发信时有的帐号能发到 libotang_2001这个帐号没有什么问题，然而有几个内部的帐号发送时服务器就一直退信，不管发什么都退。
别的帐号没有这种情况，就 libotang_2001有问题，请帮忙看看这是怎么回事。

Fri 2007-01-26 14:21:57: Session 4003; child 1
Fri 2007-01-26 14:21:53: Parsing Message <d:\mdaemon\queues\remote\pd35000021959.msg>
Fri 2007-01-26 14:21:53: From: jackshth@XXXXX.com
Fri 2007-01-26 14:21:53: To: libotang_2001@XXXXX.com
Fri 2007-01-26 14:21:53: Subject: test
Fri 2007-01-26 14:21:53: Message-ID: <[email=00df01c74112$41fec1a0$657ba8c0@SHENGHUAHONG]00df01c74112$41fec1a0$657ba8c0@SHENGHUAHONG[/email]>
Fri 2007-01-26 14:21:53: MX-record resolution of [XXXXX.com ] in progress (DNS Server: 61.177.7.1)...
Fri 2007-01-26 14:21:57: Name server reports domain name unknown
Fri 2007-01-26 14:21:57: Attempting SMTP connection to [XXXXX.com : 25]
Fri 2007-01-26 14:21:57: A-record resolution of [XXXXX.com ] in progress (DNS Server: 61.177.7.1)...
Fri 2007-01-26 14:21:57: Name server reports domain name unknown
Fri 2007-01-26 14:21:57: This message is 0 minutes old; it has 60 minutes left in this queue
Fri 2007-01-26 14:21:57: SMTP session terminated (Bytes in/out: 0/0)

wxhsh

好象检查一下XXXXX.com 吧，你看看他们是不是拼对了，我们公司域名较长，很多人也反映收不到，结果一检查，不是少个H，就是多个O什么的。
Name server reports domain name unknown ，这个已经提示很明显了。

job21

偶们的域名11个字母，刚刚仔细检查了一下，楼上正解，是拼错了，通讯录里建错了，直接回复的就能收到，感谢。