You're trying to post the complete HTML page. You can't do that, as it would duplicate many existing once-only tags, such as html, head, and body.
On top of that, the code would want to format the HTML you provide, making it not appear as you wish.
Your best solution to post raw HTML would actually be creating a real HTML file out of the mail, uploading it to your site, then linking to it from your board.
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