smtp.bgactu.com has no CNAME records.
Question and response
Question
dig smtp.bgactu.com. NS
Answer
The response has no answer records.
Authority
bgactu.com. 300 SOA x.ns.joker.com. hostmaster.joker.com. 2025111453 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0