web-smtp.userve.net has no CNAME records.
Question and response
Question
dig web-smtp.userve.net. NS
Answer
The response has no answer records.
Authority
userve.net. 3600 SOA ns.userve.net. hostname.userve.net. 2026022402 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0