Forwarded Email is Converted from HTML to Plain Text

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I'm using Mailgun and when I get an HTML email and try to forward it, the forwarded message is in plain text. Is there a way for me to maintain the forwarded message as HTML?

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I was able to manually set any outgoing email to use HTML with the following:

Mail::send([], [], function ($message) use ($email, $contactEmail) {
    $message->to($contactEmail)
        ->replyTo($email->from())
        ->subject($email->subject())
        ->setBody($email->body(), "text/html");
});