The original message was received at Sat, 24 Jan 2009 11:37:36 -0800
from lb.z57.com [209.75.14.120]
----- The following addresses had permanent fatal errors -----
<b@aol.com>
(reason: 550 MAILBOX NOT FOUND)
----- Transcript of session follows -----
... while talking to mailin-04.mx.aol.com.:
>>> RCPT To:<b@aol.com>
<<< 550 MAILBOX NOT FOUND
550 5.1.1 <b@aol.com>... User unknown