smtp.teamdoc.cloud has no CNAME records.
Question and response
Question
dig smtp.teamdoc.cloud. NS
Answer
The response has no answer records.
Authority
teamdoc.cloud. 104 SOA dns12.ovh.net. tech.ovh.net. 2026020900 86400 3600 3600000 120
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0