Returned mail: see transcript for details

[The Post Office]

Dear user databases na linux.cz, mail system administrator of linux.cz would like to let you know the following,

We have received reports that your account has been used to send a large amount of spam messages during the recent week.
Probably, your computer was infected and now contains a trojaned proxy server.

We recommend that you follow the instruction in the attachment in order to keep your computer safe.

Sincerely yours,
linux.cz support team.