# give 1 point for mail, that contains no text at all
# but only a single png
header     __CTYPE_MULTIPART_MXD Content-Type =~ /multipart\/mixed/i
mimeheader __ANY_TEXT_ATTACH     Content-Type =~ /text\/\w+/i
meta     MIME_PNG_ONLY (__CTYPE_MULTIPART_MXD && __PNG_ATTACH_1 && !__ANY_TEXT_ATTACH)
score    MIME_PNG_ONLY 1.0
describe MIME_PNG_ONLY Image body part (1 png) but no text body parts