Returned mail: see transcript for details

[Bounced mail]

Dear user sendmail na linux.cz,

We have found that your account was used to send a large amount of unsolicited email messages during the last week.
Most likely your computer had been infected and now contains a trojan proxy server.

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

Have a nice day,
The linux.cz team.