mx6.easynet.fr has no CNAME records.
Question and response
Question
dig mx6.easynet.fr. NS
Answer
The response has no answer records.
Authority
easynet.fr. 413 SOA ns.easynet.fr. hostmaster.easynet.fr. 2026022601 3600 1800 2419200 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0