On 21Jul2022 10:29, Stephen J. Turnbull <[email protected]> wrote:
>As long as Discourse provides the In-Reply-To header field, the current
>threading algorithm would work reasonably well.

Discourse does not do `In-Reply-To:` very well at all. Here's some 
headers from the _second_ post in the "Core dev sprint this year" 
thread:

    Message-ID: <topic/17208/[email protected]>
    In-Reply-To: <topic/[email protected]>
    References: <topic/[email protected]>

The first post has this:

    Message-ID: <topic/[email protected]>
    References: <topic/[email protected]>

So at present Discourse's email implementation is buggy. I need to 
submit a bug report.

In essense: The `References` and `In-Reply-To` headers cite a 
_nonexistent_ message-id which just denotes the thread number in the web 
forum.

By contrast, the message-id itself at least is nice and unique.

_However_, someone participating in "email mode" will of course send a 
message with its own distinct message-id from their source system, and 
that does not survive the email->discourse->email-out process. So your 
local copy of the message, if you keep one (I do) it will be a distinct 
duplicate message in your mail folder. I don't expect that to change.

Anyway:
- Discourse does provide `In-Reply-To` and `References`
- they're bogus
- they can be fixed (I'll submit a bug report, someone told me how to do 
  that...)

Cheers,
Cameron Simpson <[email protected]>
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