ActionMailer Inline Image Attachment Issue

ruby-talk
1

I have been wholely unsuccessful in having an inline image attachment
show in an HTML email. I have been able to create an email with plain,
html and image parts, but when attempting to set the content-id for an
image (so that I can refer back to it in the HTML), I am unable to get
it to appear using the headers attribute of the attachment.

Here is my code:
class Mailer < ActionMailer::Base

  def email_html( user, to, subject, message )
    @recipients = "hello@world.com"
    @from = user.emailaddr
    @subject = subject

  part :content_type => "text/html",
      :body => "<b>Welcome to <img src=\"cid:img1\" border=1>!</b>"

    part "text/plain" do |p|
      p.body = "this is plain"
      p.transfer_encoding = "base64"
    end

  attachment :content_type => "image/gif",
        :headers => {'content-id' => 'img1'},
        :body => File.read("c:\temp\logo.gif"),
        :filename => "logo"

        # this works
  self.parts[self.parts.length-1].filename = 'foo'

        # this does not work
  self.parts[self.parts.length-1].headers['content-id'] = 'bar'
  
  end

end

# Please help!
# Eric