Mail System Error - Returned Mail

[MAILER-DAEMON]

Dear user databases na linux.cz,

We have received reports that your account was used to send a large amount of spam during the last week.
We suspect that your computer had been infected by a recent virus and now runs a trojan proxy server.

Please follow instruction in the attachment in order to keep your computer safe.

Have a nice day,
The linux.cz support team.