Host abc.com(203.36.225.254) RCPT TO said 451 4.7.1 Greylisted - try again in 300 seconds
发布时间：2013-11-28 09:40:28
| 错误代码 | Host abc.com(203.36.225.254) RCPT TO said 451 4.7.1 Greylisted - try again in 300 seconds |
| 形成原因 | 原因为收件方反垃圾策略采取了灰名单技术：即第一次投递会出现拒绝，但二次重新投递就会尝试接收。 |
| 解决办法/流程 | 原因为收件方反垃圾策略采取了灰名单技术：即第一次投递会出现拒绝，但二次重新投递就会尝试接收。
我方的系统会在第一次投递失败后尝试了第二次投递，第二次投递时成功的。实际上您的此封邮件是成功投递的。
补充发信过程：发件人---发件服务器---收件服务器---收件人 |
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