我通过163给unsp@sunplus.com.cn写信，但是系统提示：
****** Message from InterScan Messaging Security Suite ******
Sent <<< MAIL FROM:<qiyajun4359@163.com> SIZE=1130
Received >>> 550 5.7.1 this system has been configured to reject your mail
Unable to deliver message to <unsp@sunplus.com.cn> (and other recipients in the same domain).
************************ End of message **********************
请问这是怎么回事？谢谢！
可以的，再试试