i want to protect my mailserver with dns blacklists for fighting the spam.
there a so many blacklists out there.
currently i use:
ix.dnsbl.manitu.net
cbl.abuseat.org
bl.spamcop.net
safe.dnsbl.sorbs.net
dnsbl.njabl.org
should i add/remove some entries? which are the best blacklists? which blacklists shouldn't used (like spamhaus)?