bmta.email.us-phoenix-1.oci.oraclecloud.com has no NS records.
NS records for this zone are defined at us-phoenix-1.oci.oraclecloud.com.
NS records for this zone are defined at us-phoenix-1.oci.oraclecloud.com.
Question and response
Question
dig bmta.email.us-phoenix-1.oci.oraclecloud.com. NS
Answer
The response has no answer records.
Authority
us-phoenix-1.oci.oraclecloud.com. 300 SOA ns1.p68.dns.oraclecloud.net. hostmaster.us-phoenix-1.oci.oraclecloud.com. 366700 3600 600 604800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0