The original message was received at Sun, 18 Jan 2009 17:18:19 -0800
from lb.z57.com [209.75.14.120]
----- The following addresses had permanent fatal errors -----
<d@d.com>
(reason: 550 Host unknown)
----- Transcript of session follows -----
550 5.1.2 <d@d.com>... Host unknown (Name server: d.com: host not found)