第一次写信怎么会出现这种情况？请解释一下

This is the mail system at host mx2-196.sinamail.sina.com.cn.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

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The mail system

<zzzjs@mail3-116.sinamail.sina.com.cn> (expanded from <zzzjs@sina.com>): host
mail3-116i.sinamail.sina.com.cn[10.55.2.116] said: 522 5.2.2 can not find
the user path (in reply to end of DATA command)这是什么意思？为什么我给老师发东西会出现这个？

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <zzzjs> (扩展从 <zzzjs>) ： 主人
mail3-116i.sinamail.sina.com .cn [10.55.2.116]说： 522 5.2.2不可能发现
用户道路(以回复数据命令的结尾)

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