mail.sendverity.com has no NS records.
NS records for this zone are defined at sendverity.com.
NS records for this zone are defined at sendverity.com.
Question and response
Question
dig mail.sendverity.com. NS
Answer
The response has no answer records.
Authority
sendverity.com. 1800 SOA ray.ns.cloudflare.com. dns.cloudflare.com. 2394306984 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0