Changes:
- almost a complete (compatible) rewrite of Razor v1.
- uses new (fuzzy) signature algorithms to better spot 'mutating'
messages
- Spam reports are now validated based on 'reputation' of the submitter
in order to make it easier to eliminate false positives.
- Registration for submitters required.
- Revocation of spam reports is now possible.
Vipul's Razor is a distributed, collaborative, spam detection and
filtering network. Razor establishes a distributed and constantly
updating catalogue of spam in propagation. This catalogue is used
by clients to filter out known spam.