> In this case, I think that caused a problem for a different reason.
> Out of convenience (and this is something I will not do again), I
> sometimes start a new mail message by "replying" to an old one, then
> changing to my new subject line. I had assumed (without ever
> bothering to check) that mail threading is done based on subject
> line, and had not noticed that the mail headers contain the
> "In-Reply-To:" information that no doubt is used for connecting the
> mail threads.

     Yes; in my case the gmane.org mail/NNTP gateway uses that to make
its references headers, and Mozilla Thunderbird uses those headers to
display and manipulate threads when I read the
gmane.comp.lang.smalltalk.squeak.general newsgroup.

> So in the future I will not use "reply to" unless actually replying
> to something.

     Thanks again!

-C

--
Craig Latta
www.netjam.org
+31 6 2757 7177 (SMS ok)
+ 1 415  287 3547 (no SMS)