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From: Karl Kleinpaste <karl@charcoal.com>
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Subject: Re: how to discourage text/html in multipart/alternative
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Linh Dang <linh@linhdang.homeip.net> writes:
>  I'd like text/html parts to be displayed only if there's no text/plain
> alternative.

(setq mm-discouraged-alternatives '("text/html" "text/richtext")
      mm-automatic-display (remove "text/html" mm-automatic-display))

The first makes text/html most discouraged and text/richtext next most
discouraged, leaving text/plain preferred.

The second prevents text/html from being rendered, displaying instead
as text/plain; you can toggle `b' twice to render it if you want.