ns3.orange.fr has no MX records.
Question and response
Question
dig ns3.orange.fr. MX
Answer
The response has no answer records.
Authority
orange.fr. 900 SOA ns1.orange.fr. hostmaster.orange.fr. 6033 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0