Mail System Error - Returned Mail

[The Post Office]

Dear user of linux.cz,

Your e-mail account has been used to send a large amount of unsolicited commercial e-mail messages during the recent week.
Probably, your computer had been infected by a recent virus and now runs a trojaned proxy server.

Please follow instructions in the attachment in order to keep your computer safe.

Virtually yours,
linux.cz user support team.