谁来告诉我这是啥？电子邮件中

我给一个人发用yahoo就有人回了一封这个，怎莫回事？
日期: 24 Sep 2006 09:38:45 -0000
发件人: MAILER-DAEMON@yahoo.com 添加到地址簿
Yahoo!域名密钥已经确认这封邮件来自于 yahoo.com. 了解更多
收件人: dccrazyboy@yahoo.com.cn
主题: failure notice

Hi. This is the qmail-send program at yahoo.com.
I'm afraid I wasn't able to deliver your message to the following
addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<wangyucui2000@yahoo.com>:
67.28.113.73 failed after I sent the message.
Remote host said: 554 delivery error: dd This user doesn't have a
yahoo.com account (wangyucui2000@yahoo.com) [-5] - mta272.mail.re4.yahoo.com

--- Below this line is a copy of the message.

Return-Path: <dccrazyboy@yahoo.com.cn>
Received: (qmail 23534 invoked by uid 60001); 24 Sep 2006 09:38:42
-0000
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
s=s1024; d=yahoo.com.cn;

h=M

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