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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Unseen attribute doesn't get saved in rmail
Date: Sat, 02 Jan 2021 22:20:30 +0200
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To: "Andrea G. Monaco" <andrea.monaco@autistici.org>
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> From: "Andrea G. Monaco" <andrea.monaco@autistici.org>
> Date: Sat, 02 Jan 2021 21:05:26 +0100
> 
> But I wonder if that workaround is enough: I saw that the hook is called
> at the end of the function rmail-show-message-1, but after the snippet
> that I posted the information I care about is lost: we don't know if the
> mail was just read for the first time or not; so we can't set the
> modified flag meaningfully.

Why does it matter for your purposes?