Hello.
As this can change quite a lot, and some RBL's can be pretty draconian, and therefore best avoided, what are people's preference for RBL lookups at the moment.
I currently use :-
sbl-xbl.spamhaus.org relays.ordb.org bl.spamcop.net opm.blitzed.org cbl.abuseat.org dnsbl.njabl.org dnsbl.sorbs.net query.bondedsender.org
Regards...Martin