how to ignore external queries?

[ic.nssip]

Hello everyone,

I'm currently using an ACL for allow-query statement, which I thought it's fine.

Recently I did a spoofability test on: 

https://www.grc.com/dns/dns.htm

and the results came up with a statement that "External Queries are REJECTED" and "It would be better for it to ignore external queries."

Question is... How can I IGNORE External Queries instead of Rejecting them?

Thank you in advance for any idea,
Julian
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