localhost.mailk1.ciberserver.com has no CNAME records.
Question and response
Question
dig localhost.mailk1.ciberserver.com. NS
Answer
The response has no answer records.
Authority
mailk1.ciberserver.com. 660 SOA ns1.ciberserver.com. status.ciberconceito.com. 2025120400 3600 7200 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0