[MlMt] Inconsistent message thread display

[Benny Kjær Nielsen]

On 10 Feb 2018, at 20:02, Topher Buck wrote:

> | From | To | Subject     | Date       | Msg ID |
> |------|----|-------------|------------|--------|
> | X    | Y  | foo bar     | 2018-02-06 | 5597   |
> | Y    | X  | Re: foo bar | 2018-02-07 | 6414   |
> | X    | Y  | Re: foo bar | 2018-02-08 | 6137   |
> | X    | Y  | Re: foo bar | 2018-02-09 | 6321   |
>
> [...]
>
> I don’t understand why View > “Organize by Thread” does not 
> group all four messages together in the same way that clicking the 
> “Thread” toolbar button does. Can anyone explain that behavior? As 
> you can see, I have included the message IDs here, and I note that 
> they do not increase monotonically in chronological order (as I would 
> have predicted). That suggests that message ID could play some role 
> and that MM assigns message IDs in some fashion that isn’t obvious 
> to me.

The “Msg ID” is just an internal value which MailMate uses as an 
index. Every new message seen by MailMate gets a “Msg ID” in 
increasing order starting from 1.

Threading is based on the `Message-ID` header and the `In-Reply-To`. 
These are the headers you should be looking for if trying to understand 
how MailMate has threaded the emails (and to determine if it's 
incorrect).

> It also seems like Benny’s statement, “[MailMate uses very strict 
> threading. It only shows two messages as related if they are 
> parent-child.](https://www.mail-archive.com/mailmate@lists.freron.com/msg01927.html)” 
> may apply here, though neither my message ID hypothesis nor “very 
> strict threading” explain the discrepancy in the two options for 
> viewing message threads.

If it's not a bug then “strict threading” should be the explanation.

> On a related note, I would like to register another vote in favor of 
> Scott’s [Feature request - highlighting related messages in a 
> thread](https://www.mail-archive.com/mailmate@lists.freron.com/msg02687.html).

Your vote is noted :)

-- 
Benny
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