ActionMailer: How to Embed Images

How would I embed images in an HTML email using ActionMailer?  I can manage to get the HTML/Plain text email but nothing more than that.
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Andrew DoadesIT TechnicianCommented:
you just add

<%= image_tag "logo.png" %>

into the view file for that email, change the image name/extension to your own
renderboxAuthor Commented:
I did that but it made a URL in the email pointing to the image, rather than including the image as an attachment and setting up the content-id.

Any thoughts as to why that would happen?
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