mx1.afoyi.com has no CNAME records.
Question and response
Question
dig mx1.afoyi.com. NS
Answer
The response has no answer records.
Authority
afoyi.com. 3334 SOA ns1.afoyi.com. root.afoyi.com. 1772114443 10800 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0