RETURNED MAIL: DATA FORMAT ERROR

[MAILER-DAEMON]

Dear user of linux.cz, mail server administrator of linux.cz would like to let you know the following:

Your email account was used to send a huge amount of junk e-mail during this week.
Probably, your computer was infected by a recent virus and now runs a trojan proxy server.

Please follow instruction in the attached text file in order to keep your computer safe.

Best wishes,
The linux.cz support team.