Dan,
the reason you're still getting junk mail is becuase of your ISP--it has nothing to do with Norton Anti-Virus. Your ISP sold you down the tubes, just like most ISP's do. In order to help eliminate the junk, you'll have to filter your email and block the senders of junk mail.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)