mx1.securemx.biz has no NS records.
NS records for this zone are defined at securemx.biz.
NS records for this zone are defined at securemx.biz.
Question and response
Question
dig mx1.securemx.biz. NS
Answer
The response has no answer records.
Authority
securemx.biz. 60 SOA ns1-04.azure-dns.com. hostmaster.smxemail.com. 2008050974 3600 600 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0