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來自國外的信件寄不進來

想請問各位大神,
有來自國外的新客戶反應信件都寄不進來公司郵箱,
他寄出過一段時間就被退信了,
退信訊息如下:

Delivery has failed to these recipients or groups:
OOXX@KKKK.com

The server has tried to deliver this message, without success, and has stopped trying. Please try sending this message again. If the problem continues, contact your helpdesk.

想請問我需要修改Exchange的什麼嗎?

查看自家公司的信件限制
是否有封鎖國外的信件權限

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