spamchk

The original spamchk filter used by postfix is described on http://www.akadia.com/services/postfix_spamassassin.html. Remebered to post some advanced settings i made, you find it usefull if you want to split email to spam, nospam and inbetween (lightspam).

#!/bin/sh

# -----------------------------------------------------------------

# File:        spamchk

# Purpose:     SPAMASSASIN shell-based filter

# Location:    /usr/local/bin

# Usage:       Call this script from master.cf (Postfix)

# Certified:   GENTOO Linux, Spamassassin 3.0, Postfix

# -----------------------------------------------------------------

# Variables

#SENDMAIL="/usr/local/postfix/sendmail/sendmail -i"

SENDMAIL="/usr/sbin/sendmail -i"

EGREP=/bin/egrep

# Exit codes from

EX_UNAVAILABLE=69

# Number of *'s in X-Spam-level header needed to sideline message:

# (Eg. Score of 5.5 = "*****" )

SPAMLIMIT=4.5

SPAMLIMITKILL=6.1

# Clean up when done or when aborting.

trap "rm -f /var/tempfs/out.$$" 0 1 2 3 15

# Pipe message to spamc

cat | /usr/bin/spamc -s 1024000 -u filter > /var/tempfs/out.$$

#----- advanced AWK filter by simakas --------------------------------

# 050915 AWK part and splitting method to light_spam & spam

STATUS=`more /var/tempfs/out.$$ | grep -m 1 X-Spam-Status | awk '{print $3}' | awk -F= '{print $2}'`

warn=$(LC_ALL=C  awk 'BEGIN{if('$STATUS'>='$SPAMLIMIT')print "SPAM";else print "NOSPAM"}')

kill=$(LC_ALL=C  awk 'BEGIN{if('$STATUS'>='$SPAMLIMITKILL')print "SPAM";else print "NOSPAM"}')

# Are there more than $SPAMLIMIT stars in X-Spam-Level header? :

#if $EGREP -q "^X-Spam-Level: \*{$SPAMLIMIT,}" < /var/tempfs/out.$$

if [ "$warn" = "SPAM" ]

then

  # Option 1: Move high scoring messages to sideline dir so

  # a human can look at them later:

  # mv out.$$ $SIDELINE_DIR/`date +%Y-%m-%d_%R`-$$

  # Option 2: Divert to an alternate e-mail address:

  # 050915 Drop mail if SPAMLIMITKILL is reached or deliver it to human recheck

  #  if $EGREP -q "^X-Spam-Level: \*{$SPAMLIMITKILL,}" < /var/tempfs/out.$$

     if [ "$kill" = "SPAM" ]

     then

       #Drop it like its hot

       #cp /var/tempfs/out.$$ /tmp/`date +%Y-%m-%d_%R`-$$

       rm -f /var/tempfs/out.$$

     else

       #Or deliver to trashbox for human action

       $SENDMAIL trash@svelita.lt  < /var/tempfs/out.$$

     fi

  # Option 3: Delete the message

  #rm -f /var/tempfs/out.$$

else

  $SENDMAIL "$@" < /var/tempfs/out.$$

fi

# Postfix returns the exit status of the Postfix sendmail command.

exit $?