webmail-01.totisp.net has no CNAME records.
Question and response
Question
dig webmail-01.totisp.net. NS
Answer
The response has no answer records.
Authority
totisp.net. 129 SOA ns1.totisp.net. admin.totisp.net. 2018112463 21600 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0