Unfortunately it will take more than DoS atttacks to stop them. You may be interested in this - we just got two such 419 scams FAXED to us in the past hour!

And then there is the rationale for leaving them in place as an eternal testimony to the maxim 'A fool and his money are soon parted' and 'There's no such thing as a free lunch'... And dont even get me started on the ones on greed!

Cheers,
Steve