mail.hostdone.com has no CNAME records.
Question and response
Question
dig mail.hostdone.com. NS
Answer
The response has no answer records.
Authority
hostdone.com. 3598 SOA ns11.cloudns.net. support.cloudns.net. 2022032215 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0