Yes its late, but hopefully will prevent new R6 folks from adding it to their lists. Yes its black listing the world:
8/26/03 - Osirusoft, distributer of the SPEWS and open relay blocklists, among others, is no longer operational. Servers using these lists (including the FTC) are currently rejecting ALL email. This shutdown is in response to be in response to the previous several-week-long DDoS attack on Osirusoft, SPEWS and others, resulting in both sites being down.
http://slashdot.org/articles/03/08/27/0214238.shtml?tid=111&tid=126