Spam and subject header

  penholder 14:38 29 Dec 2005
Locked

I'm using BT Yahoo e-mail which automatically sifts out likely spam and puts it in a separate file. I noticed in one such spam e-mail my full and correct e-mail address was in the subject header. Any ideas as to how this could happen?
I use a firewall, regularly use Spybot and Adware, Norton anti-virus as well as automatic updates from Bill Gates!

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