Too many topics, too little time

provided with no warranty or anything related, but:

find . -name 'mbox' -exec ~/bin/zap {} ;

is a shell script that removes duplicate mail from mail.app files by first finding the files, then executing the zap script from script macosxhints.com

#!/bin/sh
formail -D 1000000 idcache < $1 -s > ztmp && mv ztmp $1
rm idcache

all in all, it works well enough to save me quite a bit of space.

it does set all your messages as unread, so be forwarned.

it was made with the help of karlcow and shiruken on #joiito who knew -exec where i was trying |