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- it's possible to make auto-linking of resources. Say, if you have <img> on your page, the generated email will have the image attached and properly linked as "cid:" resource.
- if you have a link in email to your web-site back, it could be properly handled and checked if it actually links to correct Page.
Draft source code is here: http://files.rsdn.ru/20380/WicketTemplater.rar