The "Message-Id" field is used to identify & thread messages.  This is why on 
email discussion groups, you should not start a new thread by replying to 
another message and changing the subject, text, etc, as threaded mail readers 
will put it as part of the original thread.

Cheers,
-Neil.


On Tuesday 10 May 2005 03:10 am, Alan B. Pearce scribbled:
> >I'm one of the people who does this.  Up until your message, I didn't
> >realize that this caused a problem.  I guess I was under the impression
> >that threads were defined by the subject and if the subject changed, it
> >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?
>
> So am I, and wondering the same thing.


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