When running on your application server, ATG’s targeted e-mail system makes loopback requests back to the server to render the e-mail template for each e-mail recipient. ATG makes one loopback request to create an HTTP session, and uses that session’s ID when making subsequent loopback requests to render the template. Since ATG cannot store state in the request itself, it stores all the relevant state in the session, and copies it over to the request in the DynamoPipelineServlet.
