Umail发送邮件退信，对方临时故障分析

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

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