Take a look at this message: http://archives.gentoo.org/gentoo-dev/msg_830102dac5b409816cbef99d15475824.xml There is no word splitting and to read message I have to scroll page horizontally and this is rather inconvenient.
This is not really trivial to fix. That mail for example explicitly said to preserve formatting in it's header, and we did that. For other mails where the header says that reflow is acceptable, we do.
