Sounds like the internet is using your external dns server to do recursive 
queries.
This will reduce the unwanted queries.
On your external dns server, create 2 views, one for your internal dns 
forwarders to point to (recursive) and one for internet queries to you 
(authoritative).
Name them Inside and Outside.
Create two acls accordingly with the acl for the authoritative view set to 
'any'.
List the recursive view first in the named config file.
In the recursive view set recursion yes and additional-from-cache yes.
In the authoritative view, set both to no.

Hope this helps

JM

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