邮件服务器 收邮件问题

bfclmk

公司的服务器接收某个域名发来的邮件有问题，有时可以接收，大部分无法接收，能接收的时候延迟也很严重。
无法接收的 有时返回发送失败的邮件 有时什么信息都不返回
*********************************************************************************
Hi. This is the qmail-send program at mail.xxx.ac.cn.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
<xxx@xxxx.cn>:
CNAME lookup failed temporarily. (#4.4.3)
I'm not going to try again; this message has been in the queue too long.
--- Below this line is a copy of the message.
Return-Path: <xxx@xxx.ac.cn>
Received: (qmail 23800 invoked from network); 2 Apr 2009 02:36:10 -0000
Received: from unknown (HELO jik) (xxx@159.226.41.22)
  by 10.60.0.9 with SMTP; 2 Apr 2009 02:36:10 -0000
Date: Thu, 2 Apr 2009 11:19:28 +0800
From: "wangmingkai" <xxx@xxx.ac.cn>
To: xxx@xxx.cn
References: <200904021119009392120@xxx.cn>
Subject: =?gb2312?B?0tG2wTogwPrKt7/O?=
X-mailer: Foxmail 6, 8, 105, 25 [cn]
Mime-Version: 1.0
Content-Type: text/plain;
charset="gb2312"
Content-Transfer-Encoding: base64
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请大家帮忙看看，谢谢！

neil.fu

这个可以做备用服务器解决，备用MX记录解决

bfclmk

我先在只有一天服务器，怎么做备用服务器啊

neil.fu

备用MX记录不是备用服务器，就是在域名管理权下修改

wxhsh

最好贴出日志才好分析。