how to view inline html as text?

[Gary Funck <gary@xxxxxxxxxxxx>]

Hello, I've been receiving a fair number of e-mails
recently where the message body is inline HTML.
Mutt displays the message as uninterpreted HTML,
where 'v' (view) views the message as expected.

I have the following mailcap entry:
 text/html; /usr/bin/htmlview %s ; copiousoutput

The headers in question are:
 Content-Type: text/html; charset="utf-8"
 Content-Transfer-Encoding: base64
 Content-Disposition: inline

What sort of mutt magic do I need to add that will
cause this inline HTML message to be converted,
and displayed as text?

thanks.