From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org
X-Spam-Level: 
X-Spam-Status: No, score=-2.1 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED,
	FREEMAIL_FROM,RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL
	autolearn=ham autolearn_force=no version=3.4.4
Received: (qmail 1037 invoked from network); 18 Oct 2023 12:01:27 -0000
Received: from mx1.math.uh.edu (129.7.128.32)
  by inbox.vuxu.org with ESMTPUTF8; 18 Oct 2023 12:01:27 -0000
Received: from lists1.math.uh.edu ([129.7.128.208])
	by mx1.math.uh.edu with esmtps  (TLS1.3) tls TLS_AES_256_GCM_SHA384
	(Exim 4.96.1)
	(envelope-from <ding-owner+M39520=ml=inbox.vuxu.org@lists.math.uh.edu>)
	id 1qt5Eq-00072Z-1S
	for ml@inbox.vuxu.org;
	Wed, 18 Oct 2023 07:01:24 -0500
Received: from lists1.math.uh.edu ([127.0.0.1] helo=lists.math.uh.edu)
	by lists1.math.uh.edu with smtp (Exim 4.96.1)
	(envelope-from <ding-owner+M39520=ml=inbox.vuxu.org@lists.math.uh.edu>)
	id 1qt5El-0000Kl-04
	for ml@inbox.vuxu.org;
	Wed, 18 Oct 2023 07:01:19 -0500
Received: from mx1.math.uh.edu ([129.7.128.32])
	by lists1.math.uh.edu with esmtp (Exim 4.96.1)
	(envelope-from <ding-account@m.gmane-mx.org>)
	id 1qt0N1-008Hue-1U
	for ding@lists.math.uh.edu;
	Wed, 18 Oct 2023 01:49:31 -0500
Received: from quimby.gnus.org ([95.216.78.240])
	by mx1.math.uh.edu with esmtps  (TLS1.3) tls TLS_AES_256_GCM_SHA384
	(Exim 4.96.1)
	(envelope-from <ding-account@m.gmane-mx.org>)
	id 1qt0Mz-00GS86-2X
	for ding@lists.math.uh.edu;
	Wed, 18 Oct 2023 01:49:31 -0500
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnus.org;
	 s=20200322; h=Content-Transfer-Encoding:Content-Type:Mime-Version:Message-ID
	:Date:Subject:From:To:Sender:Reply-To:Cc:Content-ID:Content-Description:
	Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:
	In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:List-Subscribe:
	List-Post:List-Owner:List-Archive;
	bh=Wk0lZ/8MZU+k+aByHnH+pdQsefrSLXjqXG90fj9MFyE=; b=HQchV4/PbtLFjvf0B3RX2s9Yfv
	tqyIERWd1pGiOWryIAX1e9XzfT7ofaMqHGwZj3PMxZjOG75SGofVVvzEO00azyjFy9OtfUnSA1Dws
	+PFYu6Id9bYUz9unLTWuDuUZ/BgIJGHlzgsXloarl5yAVeppb2DcmNRo5BTyRKjjD8o8=;
Received: from ciao.gmane.io ([116.202.254.214])
	by quimby.gnus.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <ding-account@m.gmane-mx.org>)
	id 1qt0Mq-0003ue-97
	for ding@gnus.org; Wed, 18 Oct 2023 08:49:25 +0200
Received: from list by ciao.gmane.io with local (Exim 4.92)
	(envelope-from <ding-account@m.gmane-mx.org>)
	id 1qt0Mo-0004Ir-U3
	for ding@gnus.org; Wed, 18 Oct 2023 08:49:18 +0200
X-Injected-Via-Gmane: http://gmane.org/
To: ding@gnus.org
From: Julien Cubizolles <j.cubizolles@free.fr>
Subject: remove duplicates from a group
Date: Wed, 18 Oct 2023 08:49:13 +0200
Message-ID: <87mswgctna.fsf@free.fr>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
User-Agent: Gnus/5.13 (Gnus v5.13)
Cancel-Lock: sha1:JOhhSEMS6XlDm7LiDcsF7jLdh44=
List-ID: <ding.gnus.org>
Precedence: bulk

I've got several nnmaildir groups with many duplicate messages sharing the
same Message-ID. I know Gnus can act on duplicate messages it receives
according to nnmail-treat-duplicates, but how to deal with duplicate
messages already in a nnmaildir group ?

Ideally, I would like to mark all the duplicate messages in a group. 

-- 
Julien Cubizolles