The original message was received at Fri, 5 Dec 2008 21:11:27 -0800
from lb.z57.com [209.75.14.120]
----- The following addresses had permanent fatal errors -----
<aibscher@socal.rr.com>
(reason: 550 5.1.1 - Invalid mailbox: aibscher@socal.rr.com)
----- Transcript of session follows -----
... while talking to hrndva-smtpin01.mail.rr.com.:
>>> DATA
<<< 550 5.1.1 - Invalid mailbox: aibscher@socal.rr.com
550 5.1.1 <aibscher@socal.rr.com>... User unknown
<<< 503 5.5.1 DATA without RCPT TO