How do you stop spam?

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xmlspy

If you could remake the email systems what steps would you take to prevent spam?

Banning an email address or a domain is not really a solution. The domain can be used for spam but what happens when a new owner comes in who doesn't do spam?

I got a few Blitzer emails marked automatically as spam by my email service, mainly because of the domain they use. (I hope/know Swift isn't a spamer)

I love to have a new email account, but no matter what it always seem to fill up with spam. (reminds me a little bit of a fresh install of XP that later on clogs up)