webmail.corehrmail.com has no NS records.
NS records for this zone are defined at corehrmail.com.
NS records for this zone are defined at corehrmail.com.
Question and response
Question
dig webmail.corehrmail.com. NS
Answer
The response has no answer records.
Authority
corehrmail.com. 1800 SOA leonidas.ns.cloudflare.com. dns.cloudflare.com. 2397260474 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0