lpclsmtp01.us6.oraclecloud.com has no CNAME records.
Question and response
Question
dig lpclsmtp01.us6.oraclecloud.com. NS
Answer
The response has no answer records.
Authority
us6.oraclecloud.com. 600 SOA ns1.p201.dns.oraclecloud.net. hostmaster.oracle.com. 2026022601 7200 600 1209600 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0