Mail System Error - Returned Mail

The original message was received at Tue, 21 Nov 2006 11:29:08 +0800
from [106.66.57.105]

----- The following addresses had permanent fatal errors -----
<public-qt-comments@w3.org>

----- Transcript of session follows -----
... while talking to host 131.62.119.44:
550 5.1.2 <public-qt-comments@w3.org>... Host unknown (Name server: host not found)