http://www.spamtips.org/2011/05/dnsbl-safety-report-5142011.htmlSeveral of the well known add-on DNSBL's have changed in safety or overlap since the previous January 2011 report, so sysadmins of Spamassassin servers may want to look carefully at this new report.
https://admin.fedoraproject.org/mailman/listinfo/spamassassin-newsSubscribe to my Spamassassin for Sysadmins Announce-Only Newsletter. The next issue is coming sometime after the release of spamassassin-3.3.2.
Warren