a3mail.se.se1.protection.inumbo.net has no NS records.
NS records for this zone are defined at inumbo.net.
NS records for this zone are defined at inumbo.net.
Question and response
Question
dig a3mail.se.se1.protection.inumbo.net. NS
Answer
The response has no answer records.
Authority
inumbo.net. 900 SOA ns-1423.awsdns-49.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0