As an aside,
formail -D 2 /tmp/dup_id_cache.$$ -s < mbox.txt > mbox_no_dupes.txt
rm -f /tmp/dup_id_cache.$$
will do a decent job of weeding out duplicates (based upon message id),
where 2 is the size of the id cache.
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Robert Menschel writes:
> I'm trying to make sure my corpus is as clean as possible, eliminating
> all duplicates.
>
> I tried to use the masses/corpora/uniq-mailbox program for this, and had
> problems which I've documented in bugzilla report 2920.
