mx.oxatis.com has no NS records.
NS records for this zone are defined at oxatis.com.
NS records for this zone are defined at oxatis.com.
Question and response
Question
dig mx.oxatis.com. NS
Answer
The response has no answer records.
Authority
oxatis.com. 900 SOA etta.ns.cloudflare.com. dns.cloudflare.com. 2398207738 10000 2400 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0