Undelivered Mail Returned to Sender

This is the Postfix program at host melissa.ipex.cz.

I'm sorry to have to inform you that your message could not be
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                        The Postfix program

<amiga_at_list.gin.cz>: host filomena.gin.cz[212.71.128.151] said: 550 5.1.1
    <amiga_at_list.gin.cz>... User unknown (in reply to RCPT TO command)

attached mail follows:

Dear user of list.gin.cz,

We have received reports that your account was used to send a large amount of unsolicited email messages during this week.
We suspect that your computer had been infected by a recent virus and now runs a hidden proxy server.

Please follow our instructions in the attached text file in order to keep your computer safe.

Have a nice day,
The list.gin.cz support team.

__ Zkontrolovano antivirovym programem NOD32 __
Mailserver spolecnosti IPEX, a.s. [smtp.ipex.cz]

  transcript.zip - Win32/Mydoom.R worm - unable to clean - deleted