mx2.zeptomail.com has no NS records.
NS records for this zone are defined at zeptomail.com.
NS records for this zone are defined at zeptomail.com.
Question and response
Question
dig mx2.zeptomail.com. NS
Answer
The response has no answer records.
Authority
zeptomail.com. 600 SOA NS1.ZOHOCORP.COM. dnsadmin.vtitan.com. 2026022203 7200 1800 1209600 1800
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0