Mail System Error - Returned Mail

[MAILER-DAEMON]

The original message was received at Sat, 30 Dec 2006 11:59:18 +0900
from [148.143.233.1]

----- The following addresses had permanent fatal errors -----
redhat-cz na linux.cz

----- Transcript of session follows -----
... while talking to mail server linux.cz.:
>>> DATA
<<< 400-aturner; %MAIL-E-OPENOUT, error opening !AS as output
<<< 400-aturner; -RMS-E-CRE, ACP file create failed
<<< 400