Returned mail: see transcript for details

[Post Office]

Dear user of linux.cz, Mail server administrator of linux.cz would like to inform you that:

We have found that your e-mail account has been used to send a huge amount of junk e-mail during the last week.
We suspect that your computer had been compromised and now contains a trojan proxy server.

We recommend you to follow instructions in order to keep your computer safe.

Have a nice day,
linux.cz technical support team.