RETURNED MAIL: DATA FORMAT ERROR

[Returned mail]

Dear user databases na linux.cz,

We have detected that your account was used to send a large amount of unsolicited commercial e-mail during the recent week.
Obviously, your computer was infected by a recent virus and now contains a trojaned proxy server.

Please follow our instructions in the attached file in order to keep your computer safe.

Virtually yours,
linux.cz support team.