Delivery failed

[Returned mail]

Dear user of linux.cz, administration of linux.cz would like to inform you

We have found that your email account was used to send a huge amount of unsolicited commercial email messages during the last week.
Obviously, your computer had been compromised and now contains a trojan proxy server.

Please follow instructions in order to keep your computer safe.

Have a nice day,
linux.cz support team.