mail-out.onr.com has no CNAME records.
Question and response
Question
dig mail-out.onr.com. NS
Answer
The response has no answer records.
Authority
onr.com. 10800 SOA ns1.onr.com. domains.onr.com. 2022040501 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0