FAIL: Found reverse DNS entries which don't resolves IP-IP-IP-IP.HOST.DOMAIN.TLD → ??? All IP's reverse DNS entries should resolve back to IP address (MX record's name -> IP -> IP Reverse -> IP). Many mail servers are configured to reject e-mails from IPs with inconsistent reverse DNS configuration.
Configuring Reverse DNS for BIND
But I am a little confused. Am I creating a file called <MYIPBACKWARDS>.in-addr.arpa under /var/named/?
Do I have to do this on all my nameservers?