Returned mail: Data format error

[Returned mail]

The original message was received at Tue, 26 Dec 2006 09:28:36 +0530 from linux.cz [165.200.64.161]

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

----- Transcript of the session follows -----
... while talking to linux.cz.:
554 <sendmail na linux.cz>... Mail quota exceeded
554 <sendmail na linux.cz>... Service unavailable