服务器有时不接收电子邮件,出现错误 451

服务器有时不接收电子邮件,出现错误 451

我的一位客户试图向我发送一封电子邮件,其中包含他的电子邮件地址,但我没有收到。他收到了一封递送状态通知(延迟)。我两天后才收到这条消息

在交付状态通知中标记:

Delivery to the following recipient has been delayed:

     [email protected]

Message will be retried for 6 more day(s)

Technical details of temporary failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain outbounds200.obsmtp.com by outbounds200.obsmtp.com. [207.126.147.11].

The error that the other server returned was:
451 Cannot connect to domain:myhiddenserver.com - psmtp

知道为什么会发生这种情况吗?我检查了dns,一切似乎正常。我尝试使用其他帐户(iCloud、gmail 等,我收到了所有邮件。)而且这个人向其他人发送电子邮件没有任何问题。

我如何检查我的服务器是否正确配置以接收来自各地的邮件?

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