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The Junk Mail to Spam Converter
    Ubiquitous Computing Adjunct Proceedings October 12-15, Seattle, USA, pp 229-230 2003
    The junk mail to spam converter is a prototype designed and built to demonstrate the idea of a physical-to-virtual filter. A piece of mail is fed into a slot in the front of the machine, and a webcam takes a picture of the envelope and emails it to your account before the letter is shredded.