On Tue, 30 Sep 2003, Mike Starke wrote:

> On Tue, Sep 30, 2003 at 07:57:45AM -0700, Jeremy C. Reed wrote:
> /_
> /_And this email will add the header:
> /_ In-Reply-To: <1064604187.4459.19.camel@localhost.localdomain>

> How did you know/predict what the above value would be?

All real mail clients have a Message-Id. (If a bogus mail client doesn't
add that header, a real mail trannsfer agent will add it.)

The In-Reply-To header is just based on the Message-Id from the email
being replied to.

By the way, your mutt email client did this:

 References: <1064604187.4459.19.camel@localhost.localdomain>
     <Pine.LNX.4.43.0309300754140.19793-100000@pilchuck.reedmedia.net>
 In-Reply-To:
     <Pine.LNX.4.43.0309300754140.19793-100000@pilchuck.reedmedia.net>

(I know what it was by looking at the headers of my email in progress.)

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