ftth.fr.orangecustomers.net has no MX records.
Question and response
Question
dig ftth.fr.orangecustomers.net. MX
Answer
The response has no answer records.
Authority
ftth.fr.orangecustomers.net. 900 SOA ns1.orange.fr. hostmaster.orange.fr. 2429 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0