mail1.mazdadsg.com has no NS records.
NS records for this zone are defined at mazdadsg.com.
NS records for this zone are defined at mazdadsg.com.
Question and response
Question
dig mail1.mazdadsg.com. NS
Answer
The response has no answer records.
Authority
mazdadsg.com. 3600 SOA fh-dns1.minacs.com. hostmaster.minacs.com. 134 900 600 86400 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0