fibre.nordnet.com has no MX records.
Question and response
Question
dig fibre.nordnet.com. MX
Answer
The response has no answer records.
Authority
nordnet.com. 43200 SOA name.nordnet.fr. root.nordnet.fr. 2026021901 21600 3600 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0