#!/bin/bash

MAILIN=/tmp/lijst_mailin.$$
HEADERS=/tmp/lijst_headers.$$
REPLY=/tmp/lijst_reply.$$
TMPLIST=/tmp/lijst_tmp.$$
# these all create temporary files

# create log entry, handy for seeing if it works
logger -p mail.info -t LIST '[$$] Mail from <'$SENDER'>'

# save mail
cat > $MAILIN

# save headers
grep -B200 -m 1 -e ^$ $MAILIN > $HEADERS

# get subject
SUBJECT=$(grep -m1 -e ^Subject $HEADERS | awk -F : {'print $2'})

# messages go to 'list+todo@mydomain.com', the next line grabs the part between + and @
TYPE=$(grep -m1 -e ^To $HEADERS | sed -e 's/^.*+\(.*\)@.*$/\1/')
RCPT=$(grep -m1 -e ^To $HEADERS | sed -e 's/^To://')

$TYPE $SUBJECT > $TMPLIST
# if the message went to 'list+todo@mydomain.com' and the subject is 'list' this will be: 'todo list > $TMPLIST'

# creates the reply
echo 'To: '$SENDER > $REPLY
echo 'From: '$RCPT'(Responder)' >> $REPLY
echo 'Subject: Re:'$SUBJECT >> $REPLY
echo '' >> $REPLY
cat $TMPLIST >> $REPLY
echo '.' >> $REPLY

# Send email off
/usr/sbin/sendmail -r $RECIPIENT $SENDER < $REPLY

# Delete temp files
rm -f $MAILIN &> /dev/null
rm -f $HEADERS &> /dev/null
rm -f $REPLY &> /dev/null
rm -f $TMPLIST &> /dev/null

# Create log entry
logger -p mail.info -t LIST '[$$] Mail from <'$SENDER'> - response sent'

exit