smtp.telebecinternet.com has no CNAME records.
Question and response
Question
dig smtp.telebecinternet.com. NS
Answer
The response has no answer records.
Authority
telebecinternet.com. 10555 SOA ns1.lino.com. dnsadmin.lino.com. 2026021601 900 600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0