Why am I getting an e-mail like this?

   My e-mail came through with this type of format:

 

[Norton AntiSpam] Sexy example: Secret photos of your lucky face

 

    This is not the first time I have received such an e-mail and they have all been off color and sex oriented.

 

What does the [Norton AntiSpam] mean? Why do I have Norton if it doesn't screen this type of unsolicited e-mail?

 

Bee