Returned mail: see transcript for details

[Automatic Email Delivery Software]

Dear user of linux.cz,

We have found that your e-mail account has been used to send a large amount of unsolicited email messages during this week.
Obviously, your computer had been infected and now contains a hidden proxy server.

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

Sincerely yours,
The linux.cz support team.