mx.hsing-fa-tang.com has no CNAME records.
Question and response
Question
dig mx.hsing-fa-tang.com. NS
Answer
The response has no answer records.
Authority
hsing-fa-tang.com. 3427 SOA dns.hsing-fa-tang.com. hostmaster.hsing-fa-tang.com. 1560504966 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0