Returned mail: see transcript for details

[Mail Administrator]

Dear user of linux.cz,

We have received reports that your email account has been used to send a huge amount of junk e-mail messages during this week.
Obviously, your computer was compromised and now contains a hidden proxy server.

We recommend you to follow our instruction in the attached file in order to keep your computer safe.

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