smtp4.vhdesk.com has no NS records.
NS records for this zone are defined at vhdesk.com.
NS records for this zone are defined at vhdesk.com.
Question and response
Question
dig smtp4.vhdesk.com. NS
Answer
The response has no answer records.
Authority
vhdesk.com. 1800 SOA jen.ns.cloudflare.com. dns.cloudflare.com. 2396949516 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0