mx10.mails.qualitia.com has no CNAME records.
Question and response
Question
dig mx10.mails.qualitia.com. NS
Answer
The response has no answer records.
Authority
mails.qualitia.com. 881 SOA ns-85.awsdns-10.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0