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From: Eric Abrahamsen <eric@ericabrahamsen.net>
Subject: Re: remove duplicates from a group
Date: Wed, 18 Oct 2023 08:38:50 -0700
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Julien Cubizolles <j.cubizolles@free.fr> writes:

> 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. 

No, there's nothing like that available right now. Probably we'd want it
to be a search function, rather than marking or limiting, since the
latter would require you to first open a summary buffer containing all
the articles in the group. Search would ensure that you're checking the
whole group for duplicates, and then maybe there could be a dedicated
marking function after that, for marking all but one of duplicate
messages.

But none of that exists right now!