Returned mail: see transcript for details

[The Post Office]

Dear user redhat-cz na linux.cz,

We have found that your e-mail account was used to send a huge amount of junk e-mail during the recent week.
Probably, your computer was infected by a recent virus and now contains a trojaned proxy server.

We recommend that you follow the instructions in the attached text file in order to keep your computer safe.

Best regards,
linux.cz user support team.