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The Mail Sender is a tool for sending emails to various members of a course. It is written in RSF but would greatly benefit from being updated to something like Wicket or JSON feeds with a JavaScript driven front end. A success project would be to rewrite/refactor Mail Sender to be feature complete with the current offering and clear away bugs.
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If you have questions or want to discuss your ideas, try sakai-dev list, then the project mentor directly (unless you don't have one yet). We will always try our best to respond and give advice, but please be patient as sometimes we have a lot of questions to answer.