http://home.earthlink.net/~bobbau/email/avoiding-html/
Despite the circa-1996-grade HTML formatting, this is a nearly comprehensive page on the subject. Remember plain text good, HTML bad. At least with respect to this mailing list. Not open to debate either. Everyplace I go on the Internets where they let people fancy-format their sh1t, you end up with yellow on white blinking text, and JPG files of a chimp holding a revolver. You can do that stuff on Detroit Luv if you want. This list is the forum for people who can get their point across with good old 7bit ASCII.