#!/bin/sh

IFS=-@
set -- $SENDER
SECRET=`cat ~/Procmail/secret`

ID="$3"
HASH="$4"

IFS=.
set -- $ID

DATE=$1
PID=$2

TODAYSDATE=`date +%s`
MAXDAYS=15
MAXAGE=$[60*60*24*MAXDAYS] 
AGE=$[TODAYSDATE-DATE]

if [ $AGE -gt $MAXAGE ] 
then
 exit 1
fi

CORRECTHASH=`echo -n "$ID"-$SECRET|md5sum`

if [ "x$HASH" == "x$CORRECTHASH" ]
then
 exit 0
else
 exit 1
fi