On 26 Sep 2003, Craig Brooksby wrote:

> 1) I'm using Ximian Evolution.  When I display full headers on a
> *received* e-mail message, I don't see a <in reply to> header.  ??  (I
> can see no headers on messages as I compose them).  Like others, I have
> replied and simply changed the subject line (either creating a new
> thread on a new topic, or making it match some existing thread)  Am I to
> understand that there is a hidden header that retains "subject" info
> about the message I replied to?  And now it conflicts with my changed
> subject line??
>
> 2) When I reply to a message, how am I to know whether it is "buried
> down in a thread?"  A message is a message.  I am aware that messages
> originate from the group, and that subject lines are the key to
> belonging to a thread or not.  Am I missing something?

It appears that your X-Mailer: Ximian Evolution 1.4.3 client stripped them
out and didn't add a new one.

Other messages in this discussion have headers like:
 In-Reply-To: <20030926152728.GA62640@megconsult.com>

 References: <Pine.LNX.4.33.0309261257390.22002-100000@leary.csoft.net>
 In-Reply-To: <Pine.LNX.4.33.0309261257390.22002-100000@leary.csoft.net>

 In-Reply-To: <200309261119.51951.ed@flat5.net>

And this email will add the header:
 In-Reply-To: <1064604187.4459.19.camel@localhost.localdomain>

These are used by various email clients (and mail archives) to help keep a
thread in order (or related).

   Jeremy C. Reed
   http://bsd.reedmedia.net/