+# - rbldns: (no)?lock:weight:filename
+# declare a rbldns zone file to load. This is exactly the same as file excepted that it wraps
+# parsing of hostname to split them into 2 categories:
+# * names beginning with '*' are sorted as 'domains' and are matched as suffix
+# * names starting with an alphanumirical character are sorted as 'hostnames' and are
+# process via exact matching.
+# - dns: weight:hostname
+# use a rhbl via DNS resolution with the given weight. If a DNS lookup error occurs
+# the hostname is considered as beeing "not found". This can only be used with "hostnames"
+# typed fields.