mx.rexpriceart.com has no NS records.
NS records for this zone are defined at rexpriceart.com.
NS records for this zone are defined at rexpriceart.com.
Question and response
Question
dig mx.rexpriceart.com. NS
Answer
The response has no answer records.
Authority
rexpriceart.com. 3600 SOA dns.rexpriceart.com. hostmaster.rexpriceart.com. 1629668514 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0