+.option dns_trust_aa main domain list&!! unset
+.cindex "DNS" "resolver options"
+.cindex "DNS" "DNSSEC"
+If this option is set then lookup results marked with an AA bit
+(Authoratative Answer) are trusted when they come from one
+of the listed domains, as if they were marked as having been
+DNSSEC-verified.
+
+Use this option only if you talk directly to the resolver
+for your local domains, and list only it.
+It is needed when the resolver does not return an AD bit
+for its local domains.
+The first SOA or NS record appearing in the results is compared
+against the option value.
+
+
+.cindex "DNS" "resolver options"