ActionMailer HTML emails appear as HTML code in email client

Hi

I'm trying to send multipart emails with something like this:

Taken from http://api.rubyonrails.org/classes/ActionMailer/Base.html
[code=] class ApplicationMailer < ActionMailer::Base
    def signup_notification(recipient)
      recipients recipient.email_address_with_name
      subject "New account information"
      from "system@example.com"
      content_type "multipart/alternative"

      part :content_type => "text/html",
        :body => render_message("signup-as-html", :account =>
recipient)

      part "text/plain" do |p|
        p.body = render_message("signup-as-plain", :account =>
recipient)
        p.transfer_encoding = "base64"
      end
    end
  end[/code]
I have 2 view files signup-as-html.text.html.erb and signup-as-
plain.text.plain.erb

I sent a test email and picked it up in Apple Mail but it displays the
HTML code instead of rendering it.

Any idea why?

Mark

This article got me working:
http://www.caboo.se/articles/2006/02/19/how-to-send-multipart-alternative-e-mail-with-inline-attachments

Still seems broken though