Is it related to vbulletin database ?

[lange]

The original message was received at Tue, 5 Oct 2004 19:52:23 -0400
from localhost [127.0.0.1]

----- The following addresses had permanent fatal errors -----
[email protected]

----- Transcript of session follows -----
451 mydomainname.com: Name server timeout
Message could not be delivered for 5 days
Message will be deleted from queue

[Steve Machol]

No, this is a server error. The domain name server for mydomainname.com never responded.