mail1.redreturns.net has no NS records.
NS records for this zone are defined at redreturns.net.
NS records for this zone are defined at redreturns.net.
Question and response
Question
dig mail1.redreturns.net. NS
Answer
The response has no answer records.
Authority
redreturns.net. 1800 SOA meg.ns.cloudflare.com. dns.cloudflare.com. 2399413880 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0