rmail-mime
rmail-mime is an interactive autoloaded Lisp function in `rmailmm.el
'.
(rmail-mime &optional ARG STATE)
Toggle the display of a MIME message.
The actual behavior depends on the value of `rmail-enable-mime'.
If `rmail-enable-mime' is non-nil (the default), this command toggles
the display of a MIME message between decoded presentation form and
raw data. With optional prefix argument ARG, it toggles the display only
of the MIME entity at point, if there is one. The optional argument
STATE forces a particular display state, rather than toggling.
`raw' forces raw mode, any other non-nil value forces decoded mode.
If `rmail-enable-mime' is nil, this creates a temporary "*RMAIL*"
buffer holding a decoded copy of the message. Inline content-types are
handled according to `rmail-mime-media-type-handlers-alist'.
By default, this displays text and multipart messages, and offers to
download attachments as specified by `rmail-mime-attachment-dirs-alist'.
The arguments ARG and STATE have no effect in this case.