#!/bin/sh

        FILTER=/usr/bin/bogofilter
        FILTER_DIR=/var/spool/filter
        # WARNING! The -i is crucial, else you may see
        # messages truncated at the first period that is alone on a line
        # (which can happen with several kinds of messages, particularly
        # quoted-printable)
        POSTFIX="/usr/sbin/sendmail -i"
        export BOGOFILTER_DIR=/home/bogofilter

        # Exit codes from <sysexits.h>
        EX_TEMPFAIL=75
        EX_UNAVAILABLE=69

        cd $FILTER_DIR || \
            { echo $FILTER_DIR does not exist; exit $EX_TEMPFAIL; }

        # Clean up when done or when aborting.
        trap "rm -f msg.$$ ; exit $EX_TEMPFAIL" 0 1 2 3 15

        # bogofilter -e returns: 0 for OK, nonzero for error
        rm -f msg.$$ || exit $EX_TEMPFAIL
        $FILTER -p -u -e > msg.$$ || exit $EX_TEMPFAIL

        exec <msg.$$ || exit $EX_TEMPFAIL
        rm -f msg.$$ # safe, we hold the file descriptor
        exec $POSTFIX "$@"
        exit $EX_TEMPFAIL