Member Rara Avis
This likely isn't the best forum for this, because it's MUCH more involved than it looks. Essentially, each email includes headers preceding the actual message, and that is where you indicate the Mime type. If your email client allows you to examine the full header (most do), look for "Content-Type" for both a plain-text message and an HTML formatted message - and you'll see quite a large difference.
I've been working on a CGI script so we could start offering Digital Passions in an either/or version. It is NOT a simple process…