[HS] Politique DMARC : mails =?iso-8859-15?q?rejet=E9s?=

Bonjour,

J'ai cr=E9=E9 une Mailing-Liste qui a toujours bien fonctionn=E9,
et depuis quelque temps et maintenant, plus.

Les mails envoy=E9s =E0 la ML sont rejet=E9s par Gmail, Yahoo et Hotmail,
selon ce message :
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
Undelivered Mail Returned to Sender :
This is the mail system at host smtp.<domaine.org>
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
=46or further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<nom@gmail.com>: host gmail-smtp-in.l.google.com[64.233.184.27] said:
550-5.7.1 Unauthenticated email from yahoo.fr is not accepted due to
domain's 550-5.7.1 DMARC policy. Please contact the administrator of
yahoo.fr domain if 550-5.7.1 this was a legitimate mail. Please visit
550-5.7.1 https://support.google.com/mail/answer/2451690 to learn about
the 550 5.7.1 DMARC initiative. 200si5713646wmw.88 - gsmtp (in reply to end
of DATA command)
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Idem pour Gmail et hotmail...

Alors pourquoi la ML Debian n'a telle pas le m=EAme probl=E8me ?
(rejet des mails gmail + yahoo et hotmail)

(=E9videmment je ne le souhaite pas du tout).

Grand merci d'une piste...

Andr=E9