mail.fbusuttil.com has no NS records.
NS records for this zone are defined at fbusuttil.com.
NS records for this zone are defined at fbusuttil.com.
Question and response
Question
dig mail.fbusuttil.com. NS
Answer
The response has no answer records.
Authority
fbusuttil.com. 1800 SOA ernest.ns.cloudflare.com. dns.cloudflare.com. 2397073953 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0