Returned mail: Data format error

[MAILER-DAEMON]

The original message was received at Wed, 19 Jul 2006 10:53:24 +0200
from [55.80.156.28]

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

----- Transcript of session follows -----
... while talking to server 214.59.23.234:
554 <databases na linux.cz>... Mail quota exceeded
554 <databases na linux.cz>... Service unavailable