== 2 penny blue is... ==

...a hybrid antispam system (formerly called camram) mixing the concepts of postage and reputation to enhance communication between well-behaved parties, and slow down or deter communication from spammers. The ''2 penny blue'' system operates on a peer-to-peer basis with no central authority using proof of work puzzle values as an expression of reputation. The ''2 penny blue'' system intentionally makes payment information visible, allowing intermediate machines to filter spam closer to its point of ingress to the global email system. ''2 penny blue'' remains compatible with existing e-mail infrastructure while providing higher delivery with reliability by bypassing traditional content filters if reputation allows. There are [:why-use:lots of reasons] for using ''2 penny blue''. The most basic are:
 * No lost messages from people you email regularly.
 * Easy training and operation.
 * Low impact on users, high impact on spammers.
The current version of ''2 penny blue'' has been withdrawn because of problems with installation and CRM114 integration. The new version is forthcoming; volunteers will make it happen faster. ''2 penny blue'' is implemented in Python and is moving to use SQLite.

 [:camram.pdf:Overview of the predecessor project, camram (PDF, January 2003)]

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 .  { copyright 2002-2007 by ''2 penny blue'' }