问题描述：
这句话是什么意思"The following message to was undeliverable.”
The following message to was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-',\xca\xd5\xd0\xc5\xc8\xcb\xce\xb4\xd6\xaa\xa1\xa3'
电子邮件发送过去退回来的退信信息
The following message to was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-',\xca\xd5\xd0\xc5\xc8\xcb\xce\xb4\xd6\xaa\xa1\xa3'
电子邮件发送过去退回来的退信信息
问题解答：
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