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Sending an e-mail to the ISP is quite likely useless. The virus spoofs the "from" address and screws up the mx record, therefore the real sender is hidden. As for the attachments, I don't use yahoo...

I also recommend you ensure your antivirus protection is up to date. The example that you post has a subject line which is related to the Klez virus.



You can find info on this virus HERE
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