webmail.smtp34217.ciberserver.com has no CNAME records.
Question and response
Question
dig webmail.smtp34217.ciberserver.com. NS
Answer
The response has no answer records.
Authority
smtp34217.ciberserver.com. 10294 SOA ns1.ciberserver.com. status.ciberconceito.com. 2018051400 3600 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0