[Tfug] gmail threads by message-id? (was Re: test)

[Robert Hunter]

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On Wed, May 21, 2008 at 12:16:31PM -0700, Matt Jacob wrote:
> Robert Hunter wrote:
> > On a different subject, it appears that gmail is now threading by
> > message-id, rather than subject.  Can anyone confirm this?
> 
> I can confirm that you're nuts, but that's about it. :)

Touche! ;-)

OK, I will describe a simple test involving four email messages.

1) send first email addressed to self

2) send second email with same subject and message --> does not get
threaded with first email

3) reply to first email --> gets threaded with first email

4) reply to first email, but change subject --> does not get threaded
with first email

The conclusion I draw from (2) is that Gmail is not threading strictly
based on Subject.

The conclusion of (3) is that Gmail must be using other header info,
presumably Message-Id, to thread.

The conclusion of (4) is that Gmail must also be using Subject in
addition to other header info.

I've posted a query to the Gmail group.  Maybe they'll explain the
inner workings of Gmail threading. ;-)
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