我們公司使用www.google.com/a/xxx.com信箱,其他人寄信收信都正常,唯一這個user luoxxx@uc-lxxxx.com 收不到別人寄的信,可以正常寄出去,但是透過其他不同家或同一個網域寄給他,都會收到下列問題,我也查過DNS設定正常,假如dns不正常,其他user也會一樣的問題,請問要如何解決

This is an automatically generated Delivery Status Notification

Delivery to the following recipient failed permanently:

luoxxx@uc-lxxxx.com

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 <luoxxx@uc-lxxxx.com>... User unknown (state 14).

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