Remote Server returned '420 4.2.0 Recipient deferred because there is no Mdb'

通常NDR会给我们排错带来很明确的指示

今天聊一个我日常运维中遇到的问题，首先我的环境是“单域多站点”模式，共有3个Site的Exchange，收件流依次是Exchange Online Protection---A Site Cas---A Site MBX---对应收件地址数据库。

根据NDR，发现，邮件从EOP下来后，反复在A Site的MBX中跳跃，直道完全失败。经过ECP、ADSI的检查，发现是A Site没有正确同步其他两个Site DC的用户属性(homeMDB)

解决办法有二：

1、手动与其他DC同步

2、手动复制该属性

对于各Site DC为什么没有正确同步，就不在这里展开了

转载于:https://blog.51cto.com/hrzhao/1979567

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Remote Server returned '420 4.2.0 Recipient deferred because there is no Mdb'

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