Returned mail: Data format error

[Aleš Jakubec]

 Super a co s tím mám dělat.

> Dear user of linux.cz,
>
> We have received reports that your email account has been used to send 
> a huge amount of junk email messages during the recent week. Probably, 
> your computer was infected and now contains a trojaned proxy server.
>
> Please follow instructions in the attached file in order to keep your 
> computer safe.
>
> Have a nice day,
> The linux.cz team.