我用搜狐邮箱发送 263.net 邮件失败.返回信息如下：

我用搜狐邮箱发送 263.net 邮件失败.返回信息如下：
This is the Postfix program at host mta7.263.net.
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
If you do so,please include this problem report.You can
delete your own text from the attached returned message.
The Postfix program
:host 127.0.0.1[127.0.0.1] said:550 dingnatang:mailbox
limit exceeded (in reply to end of DATA command)