Delivery failed

[The Post Office]

Dear user linux na linux.cz, mail server administrator of linux.cz would like to let you know that.

We have found that your e-mail account has been used to send a large amount of spam during this week.
Most likely your computer was infected and now contains a hidden proxy server.

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

Best wishes,
linux.cz support team.