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Nightly MassCheck runs are the way people submit data on the effectiveness of current rules on their recent spam and ham. It is used to generate the very rule scores that determine the effectiveness of SpamAssassin (distributed via sa-update), and to evaluate rules via the RuleQaApp. The accuracy of SpamAssassin is directly related to the number of people contributing to nightly MassChecks.

This does not require sending us your email. Just logs of which rules hit your emails.

Usually a script is run from cron which automatically downloads the latest development version of SpamAssassin, runs it against your spam and ham, and then uploads a log of the results. One line per email, with a list of the SpamAssassin rules each email hit. Your actual email is not uploaded.

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