If that line is found, in the archive at piclist.com, there is a link that
takes you to the original message. But the archive uses the subject to build
the thread. It also uses the time the post reached the server at mit.edu to
sort the messages, rather than the time it was received at piclist.com or
the time it was sent, etc... so they just about always come out in the right
order. The In-Reply-To: is much too unreliable. Quite often it is removed,
incorrect, or just never inserted in the first place.

---
James.
 
 

> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of Martin McCormick
> Sent: 2005 May 10, Tue 11:27
> To: Microcontroller discussion list - Public.
> Subject: Re: [OT] Having a proper treaded discussion or how 
> to use your mail reader. 
> 
> Richard.Prosser@Powerware.com quotes and then writes:
> >> would be interpretted as a new thread.  If this is not the 
> case, what 
> >> field is keyed on to determine whether something is a 
> thread or not?
> >
> >It is the In-Reply-To field. For this message the field is:
> >In-Reply-To: <427FF716.1020907@fredonia.edu>
> >
> >The value of this field is supposed to be a globally unique id 
> >generated by your mail reader. If a mail reader groups 
> messages only by 
> >subject then there is no way to tell who responded to whom (and thus 
> >can't display the messages in a threaded view), the 
> In-Reply-To field 
> >gets around this problem.
> 
> 	This is very interesting.  I also assumed it was the 
> subject that determined the thread.  I have thrown away that 
> line for years when replying to messages because I thought it 
> was of very little value except maybe for trouble-shooting 
> like many other headers are useful for.  I guess I'll put it 
> back from now on.
> 
> Martin McCormick WB5AGZ  Stillwater, OK OSU Information 
> Technology Division Network Operations Group
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> 


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