Daniel L'Hommedieu wrote:
> 
> The spam I see pretty much all originates in China & Brazil, with some
> originating in Korea & US.  It also pretty much all originates on
> dynamic IP addresses, so if there's a way to block email from dynamic
> address ranges, I would very much be interested in that.
> 

Not exactly what you ask for, but it'll stop most of them:

http://www.spamhaus.org/zen/

HTH,
Mikael

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