mx1.inetmail.cloud has no CNAME records.
Question and response
Question
dig mx1.inetmail.cloud. NS
Answer
The response has no answer records.
Authority
inetmail.cloud. 3 SOA ns01.inet.co.th. root.inetmail.cloud. 843 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0