list.dsbl.org,DSBL Blacklist
sbl-xbl.spamhaus.org, SpamHaus combined SBL-XBL
dnsbl.ahbl.org, The Abusive Hosts Blocking List 
bl.spamcop.net, SpamCop
cbl.abuseat.org, CBL Composite Blocking List
dnsbl.sorbs.net, SORBS
relays.ordb.org, Open Relay Database
dsn.rfc-ignorant.org, RFC-Ignorant