[MlMt] question about Message-ID based threading

[Benny Kjær Nielsen]

On 3 Sep 2018, at 15:11, Peter van Dijk wrote:

> when one of my coworkers makes a new calendar appointment, I get an 
> email with headers like this:
>
> Message-ID: 
> <Appointment.c26b5086-af7a-11e8-91be-b3acf41bfd87.1535975573228 at example.com>
> In-Reply-To: 
> <Appointment.c26b5086-af7a-11e8-91be-b3acf41bfd87 at example.com>
> References: 
> <Appointment.c26b5086-af7a-11e8-91be-b3acf41bfd87 at example.com>
> Subject: New appointment: ...

Ok, the `Message-ID` header is fine, but it makes little sense that it 
refers to non-existing messages. I wonder if that serves any purpose at 
all...

> Then when somebody accepts, declines, etc., I get an email with 
> headers like this:
>
> Message-ID: 
> <Appointment.c26b5086-af7a-11e8-91be-b3acf41bfd87.1535976655967 at example.com>
> In-Reply-To: 
> <Appointment.c26b5086-af7a-11e8-91be-b3acf41bfd87 at example.com>
> References: 
> <Appointment.c26b5086-af7a-11e8-91be-b3acf41bfd87 at example.com>
> Subject: Appointment changed: ...

Again, the `Message-ID` is fine. The only requirement is that two 
different messages should never have the same `Message-ID`.

> Several mail clients tie these two messages together into a thread, 
> but MailMate does not. Is this configurable? Is this a bug?

It's not a bug. MailMate threading is based on the headers above and the 
non-existing root messages means that MailMate cannot display these 
messages as children of the same message.

It's also not configurable, but that's something which is still not on 
my list. Usually, other email clients would group emails based on the 
subject, but in this case that appears to not be sufficient. In this 
case they should be grouped because they refer to the same non-existing 
message (which I still think is weird). I'll make a note of this special 
case.

> To be clear, there is no actual message with the ID referred to in 
> In-Reply-To and References.

I would claim that is a bug, but that's not something I can do anything 
about (other than trying to work around it when threading is more 
flexible).

-- 
Benny
https://freron.com/become_a_mailmate_patron/
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