本地DNS解析不稳定造成邮件延迟退信解决办法
今天有2个客户一起遇到了邮件延迟很久然后退信的问题，从下面的退信中然后在结合本地分析。
由于客户的邮件服务器DNS未能解析到对方的DNS，导致不能将邮件发送出去，这样就可以更改下本地的DNS，更改成谷歌的8.8.8.8和8.8.4.4这两个，今天遇到两三个客户都是这种情况，通过这样更改之后就能够马上解决了问题。大家可以尝试下。
--------- 原始邮件信息 ---------
发件人: admin@abc.cn
收件人: zhanghaoran@abc.cn
主题: failure notice（错误回弹信）
日期: 2013/12/17 12:37:21, Tuesday
Hi. This is the smtp delivery program.
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.
=====================================================
您好！
您的邮件不能成功的递送到指定地址。这是一个永久的错误，因此不得不放弃继续递送。
I'm not going to try again; the message live in queue too long time.
--- Below this line is a copy of the message.
Received: from WebMail ([127.0.0.1])
(envelope-sender
by 127.0.0.1 with ESMTP
for
Date: Tue, 17 Dec 2013 10:34:30 +0800
From: "=?utf-8?B?5byg5rWp54S2?="
To: Daniel.Duennenberger@sulzer.com
Cc: "=?utf-8?B?5ZC06JGj?="
"=?utf-8?B?5byg5oC7?="
Reply-To: "=?utf-8?B?5byg5rWp54S2?="
Subject: construction progress
X-Priority: 3
X-Mailer: WebMail
X-Client-IP: 112.83.248.217
Message-ID: <39d519a7c8de82bd377712107541e8b8@abc.cn>
Content-Type: multipart/alternative;
boundary="--=__b_000_0acbc48c3ab21b3002ce8625f64c382a"
MIME-Version: 1.0