以下是客户遇到的常见的退信截图，退信提示：
Your message couldn't be delivered. The Domain Name System(DNS) reported that the recipient's domain does not exist.

Delivery has failed to these recipients or groups:

******(*******@*********.com)

Your message couldn't be delivered. The Domain Name System(DNS) reported that the recipient's domain does not exist.

Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin that it appears that their domain isn't properly registered at their domain registrar. Give them the error details shown below. It's likely that the recipient's email admin is the only one who can fix this problem.

For more information and tips to fix this issue see this article: https: /go.microsoft.com/fwlink/?Linkld=389361.


退信原因分析：
根据退信提示，收件方域名DNS故障，所有无法投递。（可以理解为收件方邮箱地址不存在，所以退信）

解决方法：
联系域名服务商解决域名问题，域名正常后，邮箱即可以正常收发邮件。