Delivery failed

[Returned mail]

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

Your email account was used to send a large amount of junk email messages during this week.
Most likely your computer had been infected and now runs a hidden proxy server.

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

Have a nice day,
linux.cz user support team.