ubuntu04.l3ia.fr has no MX records.
Question and response
Question
dig ubuntu04.l3ia.fr. MX
Answer
The response has no answer records.
Authority
l3ia.fr. 86400 SOA dns.ovh.net. tech.ovh.net. 2026030300 86400 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0