Mail System Error - Returned Mail

[Mail Administrator]

The original message was received at Sat, 17 Mar 2007 04:37:18 +0530
from linux.cz [219.227.175.140]

----- The following addresses had permanent fatal errors -----
<sendmail na linux.cz>

----- Transcript of the session follows -----
... while talking to mail server linux.cz.:
550 5.1.2 <sendmail na linux.cz>... Host unknown (Name server: host not found)

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