Forum Moderators: phranque
bl.spamcannibal.org
bl.spamcop.net
blackholes.five-ten-sg.com
blackholes.mail-abuse.org
cbl.anti-spam.org.cn
cblless.anti-spam.org.cn
cblplus.anti-spam.org.cn
dialups.mail-abuse.org
dnsbl.ahbl.org
dnsbl.karmasphere.com
dnsbl.njabl.org
dnsbl.sorbs.net
map.spam-rbl.com
rbl-plus.mail-abuse.org
relays.mail-abuse.org
sbl.spamhaus.org
sbl-xbl.spamhaus.org
sorbs.dnsbl.net.au
xbl.spamhaus.org
zen.spamhaus.org
[edited by: Compworld at 1:46 pm (utc) on Aug. 18, 2007]
Declude maintain a nice list [declude.com] of relatively up-to-date RBLs which might be of use otherwise.
I would second Receptional Andy's advice and go with [spamassassin.apache.org...]