[exim] dnsbl whitelist

Hello,

I'm trying to create a white list for some problem senders as sorbs list
whole blocks instead of individual IPs.

What would I have to list exactly in the whitelist? Domain name or IP,
or both?

  deny    message        = DNSBL listed at $dnslist_domain\n$dnslist_text
          dnslists       = zen.spamhaus.org : \
                           list.dsbl.org : \
                           bl.spamcop.net : \
                           dnsbl.ahbl.org : \
                         # cn-kr.blackholes.us : \
                           dnsbl.njabl.org : \
                           dynablock.njabl.org : \
                           dul.dnsbl.sorbs.net :\
                           short.rbl.jp
         !sender_domains = lsearch;/usr/local/exim/domain_whitelist