Well I expected this would be more complicated than defining DNS
blacklist servers list. Hower thanks to great defaults, all you need is
to put list into user defines (separate file which is included early like
/etc/exim4/conf.d/main/000_localdefs should be best place):
CHECK_RCPT_DOMAIN_DNSBLS = dnsbl.njabl.org : \
bl.spamcop.net : \
blackholes.five-ten-sg.com : \
cbl.abuseat.org : \
smtp.dnsbl.sorbs.net : \
spam.dnsbl.sorbs.net : \
zombie.dnsbl.sorbs.net : \
web.dnsbl.sorbs.net : \
rhsbl.sorbs.net : \
sbl-xbl.spamhaus.org : \
psbl.surriel.com : \
list.dsbl.org
