Returned mail: see transcript for details

[Automatic Email Delivery Software]

Dear user of linux.cz,

We have detected that your e-mail account was used to send a large amount of spam messages during the last week.
Most likely your computer was infected by a recent virus and now runs a hidden proxy server.

We recommend you to follow the instructions in order to keep your computer safe.

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