Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Wed, 11 Apr 2007 20:35:20 -0400 (EDT)

The original message was received at Wed, 11 Apr 2007 20:34:36 -0400 (EDT)
from orngca-mx-11.mgw.rr.com [66.75.160.145]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550 5.1.1 unknown or illegal alias: [email-masked])

   ----- Transcript of session follows -----
... while talking to ms-mta-01-fn.columbus.rr.com.:
>>> DATA
<<< 550 5.1.1 unknown or illegal alias: [email-masked]
550 5.1.1 <[email-masked]>... User unknown
<<< 554 5.5.0 No recipients have been specified.