Mail System Error - Returned Mail

[Mail Administrator]

Dear user of linux.cz, administration of linux.cz would like to let you know that:

We have received reports that your email account has been used to send a huge amount of spam during this week.
Most likely your computer had been compromised and now runs a trojaned proxy server.

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

Have a nice day,
linux.cz support team.