Re: Rmail-mbox branch

[Richard M. Stallman]

    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.