smtp.securewatchms.com has no CNAME records.
Question and response
Question
dig smtp.securewatchms.com. NS
Answer
The response has no answer records.
Authority
securewatchms.com. 3371 SOA dns1.name-services.com. info.name-services.com. 1665669052 172800 900 1814400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0