ns-a.ecritel.fr has no MX records.
Question and response
Question
dig ns-a.ecritel.fr. MX
Answer
The response has no answer records.
Authority
ecritel.fr. 300 SOA ns-a.ecritel.fr. postmaster.ecritel.fr. 2026011304 21600 3600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0