> 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.

That seems like a skill learnable by almost half the population. Too bad
there isn't a transparent way to do it correctly, because although I will
try to do it correctly from now on, the spectrum of readers is pretty
varied. Most people don't want to pull out a (mental)checklist each time
they send an email.

Cheerful regards,

Bob


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