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Here's the procedure you'll need to follow, if you wish to submit data for the rescoring run for 3.1.0 using MassCheck:
Clean up the corpus of mail you intend to mass-check MassCheck (see CorpusCleaning),
and get an rsync account (see RsyncAccounts). The latter can be done while mass-check is running, btw, it's not needed until the end; and the 'checking for false positives and false negatives' stage of corpus cleaning can be done afterwards as well.
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