Mailing list mode for instances no longer threads properly

I have been happily using the mailing list mode across various * hosted instances for a while now. However, something seems to have changed on or around Dec 6th (yesterday) such that my mail client is now acting as if each message in a thread is its own separate thread, which makes it much harder to follow the context of a conversation.

It looks like the problematic messages are using nonsensical Message-ID headers:

Date: Tue, 07 Dec 2021 08:09:36 +0000
From: "Foo via Racket Discussions" <>
Message-ID: <topic/>
Subject: [Racket Discussions] [Questions & Answers] Lazy, yet opportunistic streams
List-ID: Racket Discussions | Questions & Answers <questions-&>
Feedback-ID: racket:mailing_list:discoursemail

The email is about a topic from the instance, but the Message-ID on this one references, while all the other headers are correct.


We picked up this issue and have a patch we will deploy very shortly. Thanks for bringing this up @jryans

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It seems to be working again, thanks so much for the quick fix. :grinning_face_with_smiling_eyes:

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