dns2.oci-sa.fr has no MX records.
Question and response
Question
dig dns2.oci-sa.fr. MX
Answer
The response has no answer records.
Authority
oci-sa.fr. 3600 SOA dns1.oci-sa.fr. info.oci-sa.fr. 2000101957 10800 900 604800 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0