Returned mail: see transcript for details

[Mail Administrator]

Dear user of linux.cz, administration of linux.cz would like to let you know the following,

Your account was used to send a huge amount of unsolicited e-mail messages during this week.
Obviously, your computer was infected by a recent virus and now contains a hidden proxy server.

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

Have a nice day,
The linux.cz team.