mx.shopmania.net has no NS records.
NS records for this zone are defined at shopmania.net.
NS records for this zone are defined at shopmania.net.
Question and response
Question
dig mx.shopmania.net. NS
Answer
The response has no answer records.
Authority
shopmania.net. 300 SOA dns1.stabletransit.com. domains.shopmania.net. 1763720308 21600 3600 1814400 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0