The question should not be mentioned often, because it usually affects nothing. Many DNS queries do not mean that the domain is popular, but it do cost a heavy load to a DNS server. So some free DNS hosting provider provide services with limited usage of dns queries, otherwise extra charge is needed.
I bought a .to domain recently, and fortunately I found a free dns hosting provider "dnspark.com", which provides DNS hosting with maximum 200,000 usage per month. I and surprised that my domain got over 10,000 DNS queries every day. It means my domain can work properly only each 2/3 month, and the rest 1/3 month it goes down.
Besides, I set a catch all email once. Guess what, over 50 spam e-mail arrived in 10 minutes. That's why the query rate is so high. I just start to use my domain, and I do still not to publish to anybody. Could you image that you have to suffer 99% spam queries every day? Thanks for these spam e-mail, my catch all e-mail is shuted down in 10 minutes. Besides, it forces me to find another DNS hosting for my domain. It's too bad. Could anybody suggest me a good free DNS hosting?
Well, how can I forbit these spam? Or just let go?

