ns-a.ecritel.com has no MX records.
Question and response
Question
dig ns-a.ecritel.com. MX
Answer
The response has no answer records.
Authority
ecritel.com. 300 SOA ns-a.ecritel.fr. hostmaster.ecritel.com. 2026012702 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0