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This is the mail system at host mxf.global-mail.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.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
错误如下：

<sales@yxhuawei.com>: host 58.221.79.22[58.221.79.22] said: 550 no such user
    here (umail mta) (in reply to RCPT TO command)