>>It is common for Spam/Virus's to have something saying it was scanned by some popular virus scanner. These jerks can be very clever...
>>
>>>The message was saying scanned with Norton Antivirus. But I would be more careful...
>
>No, in this case the message is from yahoo itself. It always shows this message when there is an attachment.

Yep, and I constantly get stuff from PayPal that looks exactly like it came from PayPal. All they do is copy the HTML and manipulate the email to show the sender as coming from PayPal.com and if you're not careful you are infected. I delete without opening anything that I'm not expecting. I also use Gmail which has an excellent spam filter.