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Apache Storm allows you to start small and scale horizontally as you grow. Simply add more worker.
You can chose your mails input sources (with spouts) and your functionalities (with bolts). For more details please visit http://storm.apache.org/releases/current/Concepts.html.
Apache 2 Open Source License
SpamScope can be downloaded, used, and modified free of charge. It is available under the Apache 2 license.