Xen users - Mar 2011 - DSN: failed (delivery failed)

This is a Delivery Status Notification (DSN).

I was unable to deliver your message to
username@dng.vnn.vn.

I said 
  RCPT TO:<username@dng.vnn.vn>

And they gave me the error;
  550 RCPT TO:<username@dng.vnn.vn> User unknown

 



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