Reporting-MTA: dns;blu139-omc3-s13.blu139.hotmail.com
Received-From-MTA: dns;BLU132-W29
Arrival-Date: Mon, 21 Jan 2008 08:05:37 -0800

Final-Recipient: rfc822;hanjuku@csc.jp
Action: failed
Status: 5.1.1
Diagnostic-Code: smtp;550 5.1.1 <hanjuku@csc.jp>... User unknown

つまりどういう事よ(`Д´)