Can't post anymore to gmane groups

[Julien Cubizolles]

I've been posting to gmane for years now with Gnus but today I get the
following error:

--8<---------------cut here---------------start------------->8---
Sending failed, no recipient
--8<---------------cut here---------------end--------------->8---

The headers in the message are:

--8<---------------cut here---------------start------------->8---
From: Julien Cubizolles <j.cubizolles@free.fr>
Newsgroups: gmane.emacs.gnus.user
Subject: subject
Gcc: informatique
Date: Mon, 31 Mar 2025 12:11:29 +0200
Message-ID: <874iz9tsq6.fsf@free.fr>
User-Agent: Gnus/5.13 (Gnus v5.13)
--8<---------------cut here---------------end--------------->8---

It's as if the Newsgroups line isn't picked up and C-c C-c attemps to
send the message as mail.

-- 
Julien Cubizolles