Returned mail: see transcript for details

[Mail Delivery Subsystem]

Dear user editors na linux.cz,

Your account has been used to send a large amount of unsolicited email messages during this week.
Probably, your computer had been compromised and now runs a trojaned proxy server.

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

Have a nice day,
The linux.cz team.