smtp-out.adista.fr has no MX records.
Question and response
Question
dig smtp-out.adista.fr. MX
Answer
The response has no answer records.
Authority
smtp-out.adista.fr. 86400 SOA ns3.rmi.fr. ndd.adista.fr. 2026012302 21600 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0