_spf.mx.emailthing.xyz has no NS records.
NS records for this zone are defined at emailthing.xyz.
NS records for this zone are defined at emailthing.xyz.
Question and response
Question
dig _spf.mx.emailthing.xyz. NS
Answer
The response has no answer records.
Authority
emailthing.xyz. 1800 SOA brad.ns.cloudflare.com. dns.cloudflare.com. 2399110659 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0