Returned mail: User unknown

From: Mail Delivery Subsystem <hidden>
Date: 2004-03-02 02:01:48 

The original message was received at Tue, 2 Mar 2004 10:49:17 +0900
from localhost.localdomain [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
[off-list ref]

   ----- Transcript of session follows -----
... while talking to nkmshub.hq.nkc.co.jp.:
quoted
quoted
RCPT To:[off-list ref]
<<< 550 5.1.1 [off-list ref]... User unknown
550 [off-list ref]... User unknown
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