v5185.v5e7d848e.usw1.send.mailgun.net has no NS records.
NS records for this zone are defined at v5e7d848e.usw1.send.mailgun.net.
NS records for this zone are defined at v5e7d848e.usw1.send.mailgun.net.
Question and response
Question
dig v5185.v5e7d848e.usw1.send.mailgun.net. NS
Answer
The response has no answer records.
Authority
v5e7d848e.usw1.send.mailgun.net. 300 SOA ns-cloud-a1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0