ServFail is returned when not valid.
3. The **dnsupdate** setting is checked. Refused is returned when the
setting is 'no'.
-4. If update policy Lua script is provided then next two steps are
- skipped.
+4. If update policy Lua script is provided then skip up to 7.
5. If the **ALLOW-DNSUPDATE-FROM** has a value (from both
domainmetadata and the configuration file), a check on the value is
performed. If the requestor (sender of the update message) does not