Do not forget the leading tab stop for each line! ;)
reject_rbl_client all.s5h.net, reject_rbl_client b.barracudacentral.org reject_rbl_client badconf.rhsbl.sorbs.net, #reject_rbl_client bl.emailbasura.org, reject_rbl_client bl.spamcop.net, reject_rbl_client blackholes.easynet.nl, reject_rbl_client blackholes.five-ten-sg.com, reject_rbl_client blacklist.woody.ch, reject_rbl_client black.uribl.com, reject_rbl_client block.dnsbl.sorbs.net, reject_rbl_client bogons.cymru.com, reject_rbl_client cbl.abuseat.org, reject_rbl_client cblless.anti-spam.org.cn, reject_rbl_client combined.abuse.ch, reject_rbl_client db.wpbl.info, reject_rbl_client dnsbl-1.uceprotect.net, reject_rbl_client dnsbl-2.uceprotect.net, reject_rbl_client dnsbl-3.uceprotect.net, #reject_rbl_client dnsbl.anticaptcha.net, reject_rbl_client dnsbl.dronebl.org, reject_rbl_client dnsbl.inps.de, reject_rbl_client dnsbl.sorbs.net, reject_rbl_client dnsbl.spfbl.net, reject_rbl_client dnsrbl.swinog.ch, reject_rbl_client drone.abuse.ch, reject_rbl_client duinv.aupads.org, reject_rbl_client dul.dnsbl.sorbs.net, reject_rbl_client dyna.spamrats.com, reject_rbl_client dynip.rothen.com, reject_rbl_client grey.uribl.com, reject_rbl_client http.dnsbl.sorbs.net, reject_rbl_client ips.backscatterer.org, reject_rbl_client ix.dnsbl.manitu.net, reject_rbl_client jwrh.dnsbl.net.au, reject_rbl_client korea.services.net, reject_rbl_client misc.dnsbl.sorbs.net, reject_rbl_client multi.surbl.org reject_rbl_client multi.uribl.com, reject_rbl_client nomail.rhsbl.sorbs.net, reject_rbl_client noptr.spamrats.com, reject_rbl_client orvedb.aupads.org, reject_rbl_client pbl.spamhaus.org, reject_rbl_client proxies.blackholes.easynet.nl, reject_rbl_client proxy.bl.gweep.ca, reject_rbl_client psbl.surriel.com, reject_rbl_client rddn.dnsbl.net.au, reject_rbl_client red.uribl.com, reject_rbl_client relays.bl.gweep.ca, reject_rbl_client relays.nether.net, reject_rbl_client sbl.spamhaus.org, reject_rbl_client sbl-xbl.spamhaus.org, reject_rbl_client singular.ttk.pte.hu, reject_rbl_client smtp.dnsbl.sorbs.net, reject_rbl_client socks.dnsbl.sorbs.net, reject_rbl_client sorbs.dnsbl.net.au, #reject_rbl_client spam.abuse.ch, reject_rbl_client spam.dnsbl.anonmails.de, reject_rbl_client spam.dnsbl.sorbs.net, reject_rbl_client spam.spamrats.com, reject_rbl_client spambot.bls.digibase.ca, reject_rbl_client spamrbl.imp.ch, reject_rbl_client spamsources.fabel.dk, reject_rbl_client ubl.lashback.com, reject_rbl_client ubl.unsubscore.com, #reject_rbl_client virus.rbl.jp, reject_rbl_client web.dnsbl.sorbs.net, reject_rbl_client wormrbl.imp.ch, reject_rbl_client xbl.spamhaus.org, reject_rbl_client z.mailspike.net, reject_rbl_client zen.spamhaus.org, reject_rbl_client zombie.dnsbl.sorbs.net