The original message was received at Thu, 18 Sep 2008 09:38:52 -0700
from lb.z57.com [209.75.14.120]
----- The following addresses had permanent fatal errors -----
<inc4@msn.com>
(reason: 550 Requested action not taken: mailbox unavailable)
----- Transcript of session follows -----
... while talking to mx4.hotmail.com.:
>>> DATA
<<< 550 Requested action not taken: mailbox unavailable
550 5.1.1 <inc4@msn.com>... User unknown
<<< 503 Need Rcpt command.