Returned mail: Data format error

[Mail Delivery Subsystem]

The original message was received at Mon, 25 Dec 2006 12:32:46 +0900 from linux.cz [23.254.66.189]

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

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