mx02.hornetsecurity.com has no NS records.
NS records for this zone are defined at hornetsecurity.com.
NS records for this zone are defined at hornetsecurity.com.
Question and response
Question
dig mx02.hornetsecurity.com. NS
Answer
The response has no answer records.
Authority
hornetsecurity.com. 1800 SOA hank.ns.cloudflare.com. dns.cloudflare.com. 2397088619 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0