给新浪邮箱投递电邮，返回这样一封邮件，不知道是什么情况？

Returned mail: see transcript for details

The original message was received at Mon, 16 Dec 2013 21:39:30 +0800
from:


----- The following addresses had permanent fatal errors -----

(reason: 550 5.7.0 user access deny.)

----- Transcript of session follows -----
... while talking to sina.com.:
>>> DATA
<<< 550 5.7.0 user access deny.
550 5.1.1 User unknown
<<< 554 5.5.1 Error: no valid recipients
>>> RSET
<<< 421 4.7.0 popproxy06.pop.fmail.xd.sinanode.com Error: too many errors

那到底我的这封电邮投递到对方邮箱了么？

此邮件已被拦截，原因：用户屏蔽

我是来看评论的