The original message was received at Sun, 3 Feb 2008 18:13:22 -0800
from lb.z57.com [209.75.14.120]
----- The following addresses had permanent fatal errors -----
<Frank@hotmail.com>
(reason: 550 Requested action not taken: mailbox unavailable)
----- Transcript of session follows -----
... while talking to mx3.hotmail.com.:
>>> DATA
<<< 550 Requested action not taken: mailbox unavailable
550 5.1.1 <Frank@hotmail.com>... User unknown
<<< 503 Need Rcpt command.