West Coast Labs performed an anti-spam comparative test on various email solutions related to spam detection rate over a series of at least 100,000 emails per solution.
Each solution in the test was configured in accordance with the solution provider's instructions, and was allowed to download the latest updates prior to the testing. During the course of the testing, signature updates were allowed.
Read this paper for further discussion on how the test was conducted and a close examination of the results.
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