Wanna travel back in time? I just dug out one of my Internet security presentations from May 2000. It was aimed at the executive level, so there is not much technical detail in it. It is unfortunately in German, but non-German-speakers can probably still grasp the ideas.
Looking at it 13 years later, I have the feeling we have not so much
evolved. Many of the issues still persist, even fake mail is still used -
but to a far-less extent than what it was in 2000. At least business
users (and mail systems) handle this decently ... most of the time ;)