Richard M. Stallman writes:
> The alternative would be to simply declare that Rmail/mbox will *only*
> handle multipart and text/plain media, and ignore all the rest. But
> that seems a shame when Emacs is quite capable of handling a wide
> variety of media types, including text/html, text/rich-text, image,
> audio, and even video (at least with the help of external players).
>
> I am still lost. You seem to allude to some difference between
> text/plain and text/html which I am not aware of.
It's the same difference as between text/plain and any of the other
media types mentioned: you will cannot preserve all the information in
a text/html part while saving it in mbox format.
Rmail/mbox must be prepared to decode a message each time it is
presented.