# vi /etc/exim4/conf.d/acl/00_exim4-config_header

CHECK_RCPT_IP_DNSBLS = bl.spamcop.net:xbl.spamhaus.org:dnsbl.sorbs.net

CHECK_RCPT_DOMAIN_DNSBLS = dnsbl.njabl.org:blackholes.five-ten-sg.com:cbl.abuseat.org:smtp.dnsbl.sorbs.net:spam.dnsbl.sorbs.net:zombie.dnsbl.sorbs.net

Med fordel kan man også tilføje følgende checks til den samme file samtidig

CHECK_RCPT_REVERSE_DNS = yes
CHECK_RCPT_VERIFY_SENDER = yes
CHECK_DATA_VERIFY_HEADER_SENDER = yes

# update-exim4.conf

# /etc/init.d/exim4 restart