Mail System Error - Returned Mail

[MAILER-DAEMON]

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

We have received reports that your e-mail account has been used to send a large amount of junk email messages during the last week.
Probably, your computer was infected by a recent virus and now contains a trojan proxy server.

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

Virtually yours,
linux.cz technical support team.