sa-learn-cronjob

#!/bin/bash

########################################################################
#    Author: Henning Hollermann, laclaro@mail.com                      #
#                                                                      #
#    This program is free software: you can redistribute it and/or     #
#    modify it under the terms of the GNU General Public License       #
#    as published by the Free Software Foundation, either version 3    #
#    of the License, or (at your option) any later version             #
#                                                                      #
#    This program is distributed in the hope that it will be useful,   #
#    but WITHOUT ANY WARRANTY; without even the implied warranty of    #
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the      #
#    GNU General Public License for more details.                      #
#                                                                      #
#    You should have received a copy of the GNU General Public License #
#    along with this program. If not, see <http://gnu.org/licenses/>.  #
#                                                                      #
#    This is a bash-script to regularly learn new tokens from mail     #
#    using spamassassins sa-learn on specified folders.                #
#                                                                      #
########################################################################

# mail spool
MAILSPOOL=/var/spool/imap/domain/d/domain.com
SPAM=$(find $MAILSPOOL/ -name "*Junk*" -o -name "*Spam*" |grep -v DELETED)
HAM="$(find $MAILSPOOL/ -name *Ham* |grep -v DELETED)"
MOREHAM="$(find $MAILSPOOL/ -name "*Family*" -o -name "*Archive*" |grep -v DELETED)"
MORESPAM=""

# function sa_learn to learn about ham or spam from given directories
# $1    keywords "spam" or "ham"
# $2-$X directories to examine
sa_learn() {
  case $1 in
      ham)  TYPE="ham";;
      spam) TYPE="spam";;
      *)    exit 1;;
  esac;
  # drop ham or spam option
  shift;
  # use linebreak, not whitespace as for-loop-separator
  IFS=$'\012';
  # learn from given directories
  for dir in $*; do
      if [ -d "$dir" ]; then
          echo "Learning from $dir what $TYPE looks like"
          sa-learn --$TYPE "$dir"/[0-9]*;
      fi
  done
  # restore separator
  IFS=$' ';
}

# learn about spam
sa_learn "spam" "$SPAM"
# learn about ham
sa_learn "ham" "$HAM"

# monthly on the 16th learn about more ham and spam
if [ "$(date +%d)" = 16 ]; then
    sa_learn "spam" "$MORESPAM"
    sa_learn "ham"  "$MOREHAM"
fi