Where do I configure reverse dns for the domain?
1) Checking the reverse DNS of the IP [220.127.116.11]: $ Host 18.104.22.168 Host 22.214.171.124.in-addr.arpa. not found: 3 (NXDOMAIN)
Result: ERROR, IP [126.96.36.199] does not resolve to a valid host.
The DNS IP [188.8.131.52] is not configured correctly
Response test: Remember that in order for the configuration to work correctly, you must configure the reverse DNS, to correctly reverse delegation for the DNS server and also make the configuration of corresponding direct.