[Mobilepartners] Returned mail: User unknown

[postoffice@broad.mit.edu]

The original message was received at 2009-02-23 05:39:01 -0500
from postoffice.(null) [10.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<dunnr at broad.mit.edu>

   -----Transcript of session follows -----
... while talking to postoffice.(null).:
>>> RCPT To:<dunnr at broad.mit.edu>
<<< 550 5.1.1 unknown or illegal alias: dunnr at broad.mit.edu
550 <dunnr at broad.mit.edu>... User unknown
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