rescue.hegyd.net has no MX records.
Question and response
Question
dig rescue.hegyd.net. MX
Answer
The response has no answer records.
Authority
hegyd.net. 300 SOA ns1.nom-domaine.fr. info.viaduc.fr. 2026022603 10800 3600 604800 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0