mx.zohomail.com has no NS records.
NS records for this zone are defined at zohomail.com.
NS records for this zone are defined at zohomail.com.
Question and response
Question
dig mx.zohomail.com. NS
Answer
The response has no answer records.
Authority
zohomail.com. 600 SOA ns1.zohocorp.com. dnsadmin.vtitan.com. 2026022204 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0