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Mediawiki plugin that allows users to insert a "Send to Friend" form in an article or skin - from Information Architects Japan (www.informationarchitects.jp)
The Spam Secretary is an anti-spam email filter based on the article at http://www.paulgraham.com/spam.html. It is written in python and is easy to install. It is mailclient independent, and the hope is that it will be MDA independent as well.