$ORIGIN passthru.zone.
$TTL 3600
@               IN SOA ns.passthru.zone.  hostmaster.passthru.zone. 1 600 300 604800 3600
                IN NS  ns.passthru.zone.

ns.passthru.zone. IN A 127.0.0.1

example.com         CNAME rpz-passthru.
*.example.com       CNAME rpz-passthru.
