ns2.debitrx.org has no MX records.
Question and response
Question
dig ns2.debitrx.org. MX
Answer
The response has no answer records.
Authority
debitrx.org. 3600 SOA ns1.myinfra.fr. hostmaster.cegedim.com. 65894 3600 600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0