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#!/bin/sh
################################################################################
# PROXSMTP SAMPLE SCRIPT
#
# These sample scripts are to give you an idea of how to use proxsmtp
# filtering. They are NOT intended for use on production servers.
#
# A simple proxsmtp script which replaces the subject line with one
# containing the senders email address. Uses the 'formail' command
# that comes with the 'procmail' package.
#
# Make sure the option 'FilterType' is set as follows:
# FilterType: pipe
#
# See proxsmtpd.conf(5) for configuration details
#
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# WARNING WARNING WARNING WARNING WARNING WARNING WARNING
#
# By using variables passed in from clamsmtpd in file
# manipulation commands without escaping their contents
# you are opening yourself up to REMOTE COMPROMISE. You
# have been warned. Do NOT do the following unless you
# want to be screwed big time:
#
# mv $EMAIL "$SENDER.eml"
#
# An attacker can use the above command to compromise your
# computer. The only variable that is guaranteed safe in
# this regard is $EMAIL.
#
# The following script does not escape its variables
# because it only uses them in safe ways.
#
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# Pipe the email through this command
formail -i "Subject: Changed subject from $SENDER ..."
# Filter success
exit 0
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