Hi

On 3/30/23 18:18, Rowan Tommins wrote:
So on GMail and other clients using subject-based "conversation" grouping,
this is now a third thread; on clients using header-based "thread"
grouping, it is still in the original.


It's fine. At least that ensure that this off-topic discussion doesn't pollute the view for clients that do not use a threaded view (looking at you, Gmail).

I actually enjoy getting the second copy, because I can independently
file emails that specifically target me into a separate folder.


This feels like something the mail client should be handling, not the
sender - watch/star thread, ignore/mute thread, filter by threads you've
participated in, etc

The mail client can't detect whether I'm the intended "direct" recipient of a single email within a large thread. Especially not if I didn't previously participate in it, but someone wants my opinion or expertise.

As Derick said: Deduplicating the email in your MUA is easy (the Message-ID is identical), but getting the second copy without the List-ID header is not easy.

Best regards
Tim Düsterhus

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