Pyzor is a collaborative, networked system to detect and block spam using identifying digests of messages.
Pyzor initially started out to be merely a Python implementation of Razor, but due to the protocol and the fact that Razor's server is not Open Source or software libre, I decided to impelement Pyzor with a new protocol and release the entire system as Open Source and software libre.
Since the entire system is released under the GPL, people are free to host their own independent servers. Server peering is planned for a future release.
Feel free to download Pyzor and join the pyzor-announce or pyzor-users mailing lists. All users are encourage to join the pyzor-announce list, as information about new releases and popular public servers will be posted to it.
Users are encouraged to read Steps to block spam with Pyzor so they are aware of how Pyzor should fit into their overall scheme, and to realize that Pyzor is meant to complement other techniques.