You can insert your picture in the header of your mail message so that
recipients see your face in the ‘From:’ header field if their
mail user agent is sophisticated enough. In MH-E, this is done by
placing your image in the file named by the option
mh-x-face-file which is ~/.face by default.
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. The Online X-Face Converter is a useful resource for quick
conversion of images into ‘X-Face:’ header fields.
make-face script to convert a JPEG image to the higher
resolution, color, ‘Face:’ header field.
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
nil, or simply ensure that the file
defined by this option doesn’t exist.
See Viewing Your Mail, to see how these header fields are displayed in MH-E.