More than a FAQ, try "man procmail".
Procmail can also be invoked to postprocess an already filled
system
mailbox. This can be useful if you don't want to or can't use
a
$HOME/.forward file (in which case the following script could
periodi-
cally be called from within cron(1), or whenever you start
reading
mail):
#!/bin/sh
ORGMAIL=/var/spool/mail/$LOGNAME
if cd $HOME &&
test -s $ORGMAIL &&
lockfile -r0 -l1024 .newmail.lock 2>/dev/null
then
trap "rm -f .newmail.lock" 1 2 3 13 15
umask 077
lockfile -l1024 -ml
cat $ORGMAIL >>.newmail &&
cat /dev/null >$ORGMAIL
lockfile -mu
formail -s procmail <.newmail &&
rm -f .newmail
rm -f .newmail.lock
fi
exit 0
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