Erreurs E-mail / Diagnostique / No reverse DNS is defined in IPv6

Mon serveur YunoHost

Matériel: Raspberry Pi 5 à la maison / Brique Internet avec VPN
Version de YunoHost 12.0.7 (stable)
J’ai accès à mon serveur : En SSH | Par la webadmin

Bonjour,

J’utilise l’application Vpn de Yunohost et abonnement vpn chez Franciliens.

Dans mon dernier diagnostique est apparu cette mise en garde :

Email (mail)

[ERROR] No reverse DNS is defined in IPv6. Some emails may fail to get delivered or be flagged as spam.

  • You should first try to configure reverse DNS with xxxxx.org in your internet router interface or your hosting provider interface. (Some hosting providers may require you to send them a support ticket for this).
  • Some providers won’t let you configure your reverse DNS (or their feature might be broken…). If your reverse DNS is correctly configured for IPv4, you can try disabling the use of IPv6 when sending emails by running ‘yunohost settings set email.smtp.smtp_allow_ipv6 -v off’. Note: this last solution means that you won’t be able to send or receive emails from the few IPv6-only servers out there.

Que faire ? Merci de vos conseils.