The original message was received at Thu, 16 Feb 2006 16:56:34 -0600 (CST) from **********************

----- The following addresses had permanent fatal errors -----
(reason: 550 5.1.1 User unknown)

----- Transcript of session follows ----- ... while talking to maila.microsoft.com.:
>>> RCPT To:
<<< 550 5.1.1 User unknown
550 5.1.1 ... User unknown