mh-show-use-xface-flag

mh-show-use-xface-flag is a variable defined in `mh-e.el'.
Its value is

t

Documentation:
*Non-nil means display face images in MH-show buffers.

MH-E can display the content of "Face:", "X-Face:", and
"X-Image-URL:" header fields. If any of these fields occur in the
header of your message, the sender's face will appear in the "From:"
header field. If more than one of these fields appear, then the first
field found in the order "Face:", "X-Face:", and "X-Image-URL:"
will be used.

The option `mh-show-use-xface-flag' is used to turn this feature on
and off. This feature will be turned on by default if your system
supports it.

The first header field used, if present, is the Gnus-specific
"Face:" field. The "Face:" field appeared in GNU Emacs 21 and
XEmacs. For more information, see URL
`http://quimby.gnus.org/circus/face/'. Next is the traditional
"X-Face:" header field. The display of this field requires the
"uncompface" program (see URL
`ftp://ftp.cs.indiana.edu/pub/faces/compface/compface.tar.z'). Recent
versions of XEmacs have internal support for "X-Face:" images. If
your version of XEmacs does not, then you'll need both "uncompface"
and the x-face package (see URL `ftp://ftp.jpl.org/pub/elisp/').

Finally, MH-E will display images referenced by the "X-Image-URL:"
header field if neither the "Face:" nor the "X-Face:" fields are
present. The display of the images requires "wget" (see URL
`http://www.gnu.org/software/wget/wget.html'), "fetch", or "curl"
to fetch the image and the "convert" program from the ImageMagick
suite (see URL `http://www.imagemagick.org/'). Of the three header
fields this is the most efficient in terms of network usage since the
image doesn't need to be transmitted with every single mail.

The option `mh-fetch-x-image-url' controls the fetching of the
"X-Image-URL:" header field image.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 7.0 of the MH-E package that is part of Emacs 22.1.