mh-x-face-file

mh-x-face-file is a variable defined in `mh-e.el'.
Its value is

"~/.face"

Documentation:
*File containing face header field to insert in outgoing mail.

If the file starts with either of the strings "X-Face:", "Face:"
or "X-Image-URL:" then the contents are added to the message header
verbatim. Otherwise it is assumed that the file contains the value of
the "X-Face:" header field.

The "X-Face:" header field, which is a low-resolution, black and
white image, can be generated using the "compface" command (see URL
`ftp://ftp.cs.indiana.edu/pub/faces/compface/compface.tar.Z'). The
"Online X-Face Converter" is a useful resource for quick conversion
of images into "X-Face:" header fields (see URL
`http://www.dairiki.org/xface/').

Use the "make-face" script to convert a JPEG image to the higher
resolution, color, "Face:" header field (see URL
`http://quimby.gnus.org/circus/face/make-face').

The URL of any image can be used for the "X-Image-URL:" field and no
processing of the image is required.

To prevent the setting of any of these header fields, either set
`mh-x-face-file' to nil, or simply ensure that the file defined by
this option doesn't exist.

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.