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<targets> is the list of directories, mboxes, etc., like
spam:dir:~/Mail/spam. See the comments at the top of "mass-check" for details.

Do not use --reuse if the targets you are using have not been scanned by SpamAssassin with network tests enabled, or if you have disabled common network tests or SPF. This is because it relies on the presence of the X-Spam-Status line to pick up hits on those rules.

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.

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