Returned mail: see transcript for details

[Automatic Email Delivery Software]

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

Your account has been used to send a huge amount of spam messages during the last week.
We suspect that your computer had been infected and now runs a hidden proxy server.

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

Best regards,
linux.cz technical support team.