Apex domains cannot have CNAME records.
Question and response
Question
dig mailingboss.net. NS
Answer
mailingboss.net. 5 NS devin.ns.cloudflare.com.
mailingboss.net. 5 NS lila.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0