Free RBL sites that will filter/block spam?

I'm using Domino 6 to filter/block spam mail. What are the 'free' RBL's I can use? I know you can subscribe (and pay), but are there RBL sites that will filter/block spam mail for free?
Check these out.(These are not endorsements, just a list)

osirusoft.com
dsbl.org
ordb.org

This was last published in October 2002

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