Problem: hidden proxy server?

06-15  Source: Network gathering  Views:129 

Need help with this email I just received on my .MAC account - what does it mean? Should I just ignore it, delete the message, or is there something I should be checking to prevent it from happening again? I have NOT downloaded the attachment.
Thank you. DJ
Received the following message:
FROM: returned mail <[email protected]>
SUBJECT: Returned mail: Data format error
1 attachment, 31.4 KB
Dear user [email protected],
We have detected that your account has been used to send a large amount of spam messages during the recent week.
Most likely your computer was compromised and now runs a hidden proxy server.
We recommend you to follow the instructions in the attachment in order to keep your computer safe.
Best regards,
The team. (31.4 KB)
IMac G5 17"   Mac OS X (10.4.8)   safari and firefox browsers
Ignore it, it’s junk. Most likely the attachment contains a virus meant to be run on Windows.
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