#! /bin/sh
# Init Script for SMTP Redirection for anonymous dial-in users
# as SPAM protection (prevents dial-users from direct mail delivery
# to the respective MX Hosts.
#
# Version 0.1
# Last Edit: 26.08.2002, fku
#
# Please go to http://www.init7.net/anti-spam/ for further reference
# and configuration example.
#
# You need also the dial-spam-block (http://dial-spam-block.sourceforge.net)
# for full functionality.
#
# This script is free software.
# Created by Fredy Kuenzler, Init Seven AG, kuenzler@init7.net, 26.08.2002
# Thanks to Raffy (raffy@raffy.ch) and Marco (steinacher@init7.net)
#
# Please use and redistribute it widely in order to contribute to the fight
# against worldwide spam.
#
#
#
# Please adjust the following two parameters according to your environment.
# Please note that the SMTP Server must not be in the dialrange!

dialrange=192.168.10.0/24
smtprelay=192.168.20.20


# nothing below should be adjusted

case "$1" in
    start)
	echo -n "Starting SMTP Redirect ... "
	iptables -A PREROUTING --table nat --protocol tcp --source $dialrange --dport 25 -j DNAT --to $smtprelay
	echo -e ""
	;;
    stop)
	echo -n "Shutting down SMTP Redirect ... "
	iptables -F PREROUTING --table nat
	echo -e ""
	;;
    check)
	echo -n "Checking SMTP Redirect ... "
	echo -e ""
	iptables -L --table nat -v
	echo -e ""
	;;    
    *)
	echo "Usage: $0 {start|stop|check}"
	exit 1
esac
exit 0