Update spamassassin rules, bayes learning. Script for nightly cronjob.

spamassassin-update.sh

#!/bin/bash
# where are the maildirs?
MAILROOT=/var/vmail/
DELETEDDIRS='deleted-maildirs'
SPAMDIRS='Spam'

# update rules
sa-update --allowplugins
# compile rules (for speed)
sa-compile --quiet
# learn from cur dirs only, mails, that are still new can be sorted into spam/not spam folders before being learned from
# exclude deleted maildirs
find $MAILROOT -name 'cur' -type d '!' -iregex ".*${DELETEDDIRS}.*"     -iregex ".*${SPAMDIRS}.*" -exec sa-learn --no-sync --spam {} >> /dev/null \;
find $MAILROOT -name 'cur' -type d '!' -iregex ".*${DELETEDDIRS}.*" '!' -iregex ".*${SPAMDIRS}.*" -exec sa-learn --no-sync --ham  {} >> /dev/null \;