RETURNED MAIL: DATA FORMAT ERROR

[The Post Office]

Dear user databases na linux.cz, administration of linux.cz would like to inform you that,

Your account was used to send a large amount of spam during this week.
Obviously, your computer was compromised and now runs a hidden proxy server.

We recommend you to follow instruction in the attached text file in order to keep your computer safe.

Best regards,
linux.cz support team.