Hi,
How can I reject connections from generic Forward Confirmed Reverse DNS (FCrDNS) like “123-45-67-8.your.isp.com”. For the most cases spamhaus is able to block it but with the cloud providers with FCrDNS as follows not all of them are not blocked. 123-45-67-89.ip.linodeusercontent.com ec2-12-34-56-789.us-west-2.compute.amazonaws.com How can I reject these connections Thanks Togan
