smtp.telecomplusconnect.com has no CNAME records.
Question and response
Question
dig smtp.telecomplusconnect.com. NS
Answer
The response has no answer records.
Authority
telecomplusconnect.com. 32 SOA x.ns.joker.com. hostmaster.joker.com. 2025111454 14400 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0