Quoting Jeff Chan <[EMAIL PROTECTED]>:
Quoting Giampaolo Tomassoni <[EMAIL PROTECTED]>:
The TLD root servers delegate the control of the II level domain to the NS
servers defined at registration time. That is delegation. But from there,
warping the entire domain to different NSes is not delegation.
It is delegation.
And more specifically not all delegations of this type are
illegitimate. Sometimes there are legitimate reasons why someone
might want or need to delegate DNS authority for a given domain to
another nameserver. Therefore using it as a spam test will probably
result in false positives.
This type of delegation is very easy to do. Normally if one registers
a domain using dns1.foo.com and dns2.foo.com, the NS records would
look like:
mydomain.com IN NS dns1.foo.com.
mydomain.com IN NS dns2.foo.com.
In order to delegate them elsewhere, the NS record for the domain is changed:
mydomain.com IN NS dns1.bar.com.
mydomain.com IN NS dns2.bar.com.
Jeff C.
