mx10.mails.qualitia.com has no NS records.
NS records for this zone are defined at mails.qualitia.com.
NS records for this zone are defined at mails.qualitia.com.
Question and response
Question
dig mx10.mails.qualitia.com. NS
Answer
The response has no answer records.
Authority
mails.qualitia.com. 900 SOA ns-85.awsdns-10.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0