Sisyphus is a junk mail handler of the latest generation. It has the following
features:
- requires zero configuration, neither on the server nor on the client
- works with any MTA and any client
- learns about your preferences based on all messages in your inbox and your junk folder
- can handle multiple mail accounts with independant junk mail preferences
- requires minimal resources, e.g. learning over 50000 mails and keeping track of roughly 90000 words requires only 10MB of storage