smtp.ikoula.com has no CNAME records.
Question and response
Question
dig smtp.ikoula.com. NS
Answer
The response has no answer records.
Authority
ikoula.com. 300 SOA ns1.ikoula.fr. ikoula.ikoula.com. 2026030603 3600 600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0