smtp2.visammg.com has no NS records.
NS records for this zone are defined at visammg.com.
NS records for this zone are defined at visammg.com.
Question and response
Question
dig smtp2.visammg.com. NS
Answer
The response has no answer records.
Authority
visammg.com. 1800 SOA ns1.dnsvisa.com. dns.cloudflare.com. 2366803063 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0