I am new to SpamCop. I read on this page http://www.spamcop.net/fom-serve/cache/351.html
that we can use a dns query to know if an IP is in a black list or not in our custom application/software.
The page says that if I want to check an IP like 18.104.22.168 then my dns query should be:
But for me this returns the messsage that this is a non-existent domain.
I wanted to confirm my understanding. So, if I receive non-existent domain message it means that IP is not blacklisted else it is blacklisted?
Thanks and have a nice day!