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This takes *ages* to run. -j 4 controls the number of processes to use; 4 should be OK for a single-processor machine, since most of the time they'll be waiting for network results to arrive. If you have adequate RAM and don't mind the load, you can use -j 6 or -j 8. There's not much benefit in going higher than -j 8.

The --after=10413972001072933200 option tells mass-check to ignore messages older than 18 months ago (in this case January 1 20032004). This is useful if your corpus has older messages intermingled with your newer messages.

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