[NTLK] Returned mail: User unknown

The original message was received at 2009-09-18 06:11:04 -0400
from postoffice.home [10.0.0.1]
   ----- The following addresses had permanent fatal errors -----
<niles@targetx.com>

   -----Transcript of session follows -----
... while talking to postoffice.home.:
>>> RCPT To:<niles@targetx.com>
<<< 550 5.1.1 unknown or illegal alias: niles@targetx.com
550 <niles@targetx.com>... User unknown

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Received on Fri Sep 18 06:14:34 2009