mx.zoho.jp has no CNAME records.
Question and response
Question
dig mx.zoho.jp. NS
Answer
The response has no answer records.
Authority
zoho.jp. 57 SOA ns1.zohocorp.com. dnsadmin.vtitan.com. 2026022303 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0