[Hampshire] good email readers

Hi,

Are there any mail thread readers out there that do processing on the emails.
What I would like is some tool that takes all the email in, works out
if someone is top or bottom posting, merges them all together into a
single easy to follow document.
I.e. removes all the duplicated stuff, re-arranges top posted emails
to be bottom posted for me etc.
This can't be hard to do which is why I think that someone must have
already done it.

Kind Regards

James