mxhk1.qcloudmail.com has no CNAME records.
Question and response
Question
dig mxhk1.qcloudmail.com. NS
Answer
The response has no answer records.
Authority
qcloudmail.com. 180 SOA ns3.dnsv2.com. level3dnsadmin.dnspod.com. 1769756873 3600 180 1209600 180
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0