Re: [Evolution] outlook 2000 mail not threading.

[Not Zed <notzed ximian com>]

On Thu, 2002-09-26 at 11:27, Rob Brown-Bayliss wrote:
> On Thu, 2002-09-26 at 10:52, Jeffrey Stedfast wrote:
> > You mean "Thread By Subject" that people complained about in 1.0.x and
> > made me remove it? :-)
>
> Not sure, I have attached a screenshot to show what I mean (hope you
> don't mind)
>
> Look at the mails from Blair (highlighted red) compared to the ones from
> this thread.
>
> I am using 1.1.99 and dont know what you mean by "Thread By Subject" but
> apart from the mails from Blair I like the way evo threads mail in a
> folder with replies linked to the actuall message they replied to. 
>
> How does evolution currently decide on what meassage to link a thread
> to?  

It uses the 'in-reply-to' and/or 'references' headers.  These are
supposed to be set to the last message replied to, and in the references
header, the whole string of messages (i.e. the thread) this has been
replied to.

Some (broken) mailers dont set these at all, or they set in-reply-to to
an unparsable/meaningless value (its supposed to be the message-id of
the parent message). 

The code in 1.0.8 has a fallback, that "re: xxx" is probably a reply to
"xxx", so it puts them in the thread too.  But a lot of people
complained about this (i think they thought only the subject was used
for threading, which is clearly not the case), so it was removed (fwiw i
protested about it, and refused to implement the change).  Jeff did put
in a manually adjustable config option to re-enable the old behaviour
tho.

 Z