别人给我的企业邮局发信发不过来，如下错误，怎么解决。

yihuang

The attached message had PERMANENT fatal delivery errors!

After one or more unsuccessful delivery attempts the attached message has been removed from the mail queue on this server.  The number and frequency of delivery attempts are determined by local configuration parameters.

YOUR MESSAGE WAS NOT DELIVERED TO ONE OR MORE RECIPIENTS!

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一个最近投诉的比较历害的客户，他在我这里还有别人那里都有企业邮箱，他用别人那人的给我这里发信，以前正常，但最近不正常，发不过来，出错提示是上面那个，不知是怎么意思，应该怎样解决。

rayer

他的域名，你们服务器的IP