umail遇到邮件退信，对方的临时性问题。

今天有个umail的客户发送邮件遇到此类退信的问题

--- Session Transcript ---

Thu 2013-11-28 15:08:22: Parsing message

Thu 2013-11-28 15:08:22: * From: szhherfclcusc@xx.com

Thu 2013-11-28 15:08:22: * To: arkly@zinwell.cn

Thu 2013-11-28 15:08:22: * Subject: =?utf-8?B?UmU6IDEuIEtOIFRydWNraW5nb3JkZXIgLyBaQ1dDICBleFpJTldFTEwgLzFYNDAnR1ArMVg0MCdIUS8gS05SRUYjNDExMC0wMzk2LTMxMS4xNDIjMDQ0?=

Thu 2013-11-28 15:08:22: * Size (bytes): 48985

Thu 2013-11-28 15:08:22: * Message-ID: <201311281443579044098@xx.com>

Thu 2013-11-28 15:08:22: Attempting SMTP connection to [zinwell.cn]

Thu 2013-11-28 15:08:22: Resolving MX records for [ab.cn] (DNS Server: 202.96.234.123)...

Thu 2013-11-28 15:08:22: * P=010 S=000 D=ab.cn TTL=(54) MX=[ab.cn]

Thu 2013-11-28 15:08:22: Attempting SMTP connection to [ab.cn:25]

Thu 2013-11-28 15:08:22: Resolving A record for [zinwell.cn] (DNS Server: 202.96.234.123)...

Thu 2013-11-28 15:08:22: * The name server reports that it is having technical problems

Thu 2013-11-28 15:08:22: This message is 20 minutes old; it has 0 minutes left in this queue

Thu 2013-11-28 15:08:22: Remote queue lifetime exceeded; message placed in retry queue

The name server reports that it is having technical problems

最后发现了一个很简单的问题,如遇到大量GFW，或者数据包，国际黑名单引起退信可以用RelayPod电邮邮件中继

ab.cn的mx记录不标准。详细如下：

ab.cn. 3600 IN MX 10 ab.cn

The name server reports that it is having technical problems

退信中说的是服务器报告说对方的设定有问题，临时性故障。哈哈问题解决了