You could do this with the software built into Sun Micxrosystems Unix boxes. So I know it’s possible.
The big advantage is that you can fix subject lines when threads have wandered and nobody else has remembered to update it. Another is that when you get email newsletters with many entries, you can delete all but the one or two you want to save, update the subject line to reflect it, and save it for future use.
It makes me crazy that nobody thinks this is useful, and I hear so many annoying excuses for it (‘paper trail’ – oh please!).]]>