mx02.businessdecision.com has no CNAME records.
Question and response
Question
dig mx02.businessdecision.com. NS
Answer
The response has no answer records.
Authority
businessdecision.com. 462 SOA ns0.eolas.fr. postmaster.eolas.fr. 2026020600 86400 7200 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0