mail.atomiclayer.com has no CNAME records.
Question and response
Question
dig mail.atomiclayer.com. NS
Answer
The response has no answer records.
Authority
atomiclayer.com. 241 SOA dns1.atomiclayer.com. techs.hostnexus.com. 2025122801 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0