mx22.pr3.keysurvey.com has no CNAME records.
Question and response
Question
dig mx22.pr3.keysurvey.com. NS
Answer
The response has no answer records.
Authority
keysurvey.com. 261 SOA ns-cloud-d1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0