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You can also post your SpamAssassinRules to the SARE forums at http://www.rulesemporium.com/forums/ – SARE will test rules that seem promising, and can often incorporate viable rules into their custom files faster than such rules get added to the distribution set. (this really needs to mention that rules contributed to SARE don't generally make it into SpamAssassin proper and that SpamAssassin can't take rules contributed indirectly (we need permission from the author))