英语翻译This is the Postfix program at host bjd.com.cn.I'm sorry

This is the Postfix program at host bjd.com.cn.
这是 bjd.com.cn服务器 的Postfix(邮修)软件
I'm sorry to have to inform you that the message returned below could not be delivered to one or more destinations.
抱歉的告诉您以下返回的邮件未能送达一个或多个目的地
For further assistance,please send mail to
如需要其他帮助,请发邮件到
If you do so,please include this problem report.You can delete your own text from the message returned below.
发邮件时,请附上此问题报告,同时从邮件中可删除你自己写的内容
The Postfix program
Postfix(邮修)软件
:user unknown.Command output:/usr/local/bin/maildrop:
Invalid user specified.
:未知用户.
指令输出:/usr/local/bin/maildrop:指定用户错误