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This is the OpenSN: A P2P Network Plugin For Email project ("opensn")
This project was registered on SourceForge.net on Apr 26, 2003, and is described by the project team as follows:
OpenSN is an Open Source version of SpamNet, the difference between OpenSN and SpamNet is that OpenSN will be available to all types of email applications that run from your desktop, and also run on all OSes. And plugs into email apps to help stop spam.
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Of benefit to users, Open Source software is licensed so you can download and use the software free-of-charge. The source code for this software is made available free-of-charge, you (or a programmer you hire) can make changes to this software to better meet your needs, and you can release your changed code back to the community passing the benefit on to other users.
To join this project, please contact the project administrators of this project, as shown on the project summary page.
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If you are a web page developer interested in this project, please consider reaching out to the project admin (per the "Join this project" section, above) to offer your assistance.