message not correctly "tagged"

I am using mimemail and just added a webform to my site. I configured it to use html for everything, but this is what I get from a webform: (special attention to Content-Type: text/plain; charset="utf-8")

From - Mon Jul 16 12:51:46 2007
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Return-path: <webmaster@escoltesiguies.cat>
Envelope-to: webmaster@escoltesiguies.cat
Delivery-date: Mon, 16 Jul 2007 12:49:02 +0200
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	for webmaster@escoltesiguies.cat; Mon, 16 Jul 2007 12:49:02 +0200
Date: Mon, 16 Jul 2007 12:49:01 +0200
To: webmaster@escoltesiguies.cat
From: "webmaster@escoltesiguies.cat" <webmaster@escoltesiguies.cat>
Subject: Form submission from:  Suggeriments
Message-ID: <ab933ef8066711fb500d9123f3d4e0fa@www.escoltesiguies.cat>
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Content-Type: text/plain; charset="utf-8"

<p>Submitted on 07/16/2007 - 12:49<br />
Submitted by user: admin [85.48.253.144]</p>
<p>Submitted values are:<br />
  Correu electrònic: <a href="mailto:enboig@gmail.com">enboig@gmail.com</a><br />
  Suggeriment: segona prova d'html</p>
<p>The results of this submission may be viewed at:<br />
<a href="http://www.escoltesiguies.cat/node/416?sid=6" title="http://www.escoltesiguies.cat/node/416?sid=6">http://www.escoltesiguies.cat/node/416?sid=6</a></p>