mail.ns1.ispvds.com has no NS records.
NS records for this zone are defined at ns1.ispvds.com.
NS records for this zone are defined at ns1.ispvds.com.
Question and response
Question
dig mail.ns1.ispvds.com. NS
Answer
The response has no answer records.
Authority
ns1.ispvds.com. 3600 SOA land.cde1.xyz. root.land.cde1.xyz. 2021092404 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0