Random entry – here’s a procmail script that will automatically squirrel away any e-mails with [ ] in the subject into a mail folder with the name of the contents of the [ ] (after stripping out any nasty characters):
SUBJ = `formail -xSubject | expand | \
sed -e 's/.*\[(.*)\].*/\1/' -e 's/ /_/g' \
-e 's/[^_a-zA-Z0-9]//g'`
:0 H
* ^Subject:.*\[.*\].*
lists/${SUBJ}
