www.nordnet.com has no MX records.
Question and response
Question
dig rpsec-adv1.nordnet.fr. MX
Answer
The response has no answer records.
Authority
nordnet.fr. 360 SOA name.nordnet.fr. root.nordnet.fr. 2026022401 21600 3600 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0