451 ： Name server timeout Warning: message still undelivered after 4 hours Will keep trying until message is 5 days old
发布时间：2013-11-27 20:10:17
| 错误代码 | 451 ： Name server timeout Warning: message still undelivered after 4 hours Will keep trying until message is 5 days old |
| 形成原因 | 451临时错误， 收信方服务器名查询超时。 注意：4个小时了还没投递，但是在5天内仍然会继续重试 原因是由于发件方DNS服务器无法查询到 收信方 的MX记录导致无法进行服务器的解析和投递。
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| 解决办法/流程 | 建议：请对方服务器检查核实具体的原因，因为退信当时邮件还在对方的服务器上没有投递出来 |
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原文分享地址:http://www.hb-163.com/fault/dns/633.html
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