mx1.telebecinternet.com has no CNAME records.
Question and response
Question
dig mx1.telebecinternet.com. NS
Answer
The response has no answer records.
Authority
telebecinternet.com. 10402 SOA ns1.lino.com. dnsadmin.lino.com. 2026021601 900 600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0