kudos to Eric.  He is right - it is very counter intuitive.  Spamdyke 
blocks 98.9% of spam and doing as Eric suggested got rid of another 1%.

On 1/12/2011 11:00 AM, spamdyke-users-requ...@spamdyke.org wrote:
> Another method of rejecting this sort of spam (forged from addresses) is
> to blacklist the domains that you host. This is counter intuitive, but
> works very well. Since all of your domains' users authenticate (they all
> do authenticate, right?), they will pass spamdyke's filters, and all
> imposters will be rejected.
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