This is a Delivery Status Notification (DSN). I was unable to deliver your message to zhangnd@163.net. I said RCPT TO:<zhangnd@163.net> And they gave me the error; 550 <zhangnd@163.net>: Invalid User _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users