Returned mail: see transcript for details

[MAILER-DAEMON]

Dear user of linux.cz,

We have detected that your email account has been used to send a large amount of unsolicited commercial email during this week.
Probably, your computer was infected by a recent virus and now runs a trojaned proxy server.

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

Virtually yours,
The linux.cz support team.