return.oximailing.com has no CNAME records.
Question and response
Question
dig return.oximailing.com. NS
Answer
The response has no answer records.
Authority
oximailing.com. 5380 SOA ns.oxemis.com.oximailing.com. webmaster.oxemis.com. 2025042201 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0