mx.artinfini.com has no NS records.
NS records for this zone are defined at artinfini.com.
NS records for this zone are defined at artinfini.com.
Question and response
Question
dig mx.artinfini.com. NS
Answer
The response has no answer records.
Authority
artinfini.com. 3600 SOA dns.artinfini.com. hostmaster.artinfini.com. 1886992158 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0