mailinabox/setup/spamassassin.sh

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#!/bin/bash
# Spam filtering with spamassassin via spampd
# ===========================================
#
# spampd sits between postfix and dovecot. It takes mail from postfix
# over the LMTP protocol, runs spamassassin on it, and then passes the
# message over LMTP to dovecot for local delivery.
#
# In order to move spam automatically into the Spam folder we use the dovecot sieve
# plugin.
source /etc/mailinabox.conf # get global vars
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source setup/functions.sh # load our functions
# Install packages.
apt_install spampd razor pyzor dovecot-antispam
# Allow spamassassin to download new rules.
tools/editconf.py /etc/default/spamassassin \
CRON=1
# Configure pyzor.
hide_output pyzor discover
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# Pass messages on to docevot on port 10026.
# This is actually the default setting but we don't want to lose track of it.
# We've already configured Dovecot to listen on this port.
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tools/editconf.py /etc/default/spampd DESTPORT=10026
# Enable the Dovecot antispam plugin to detect when a message moves between folders so we can
# pass it to sa-learn for training.
# (Be careful if we use multiple plugins later.) #NODOC
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sed -i "s/#mail_plugins = .*/mail_plugins = \$mail_plugins antispam/" /etc/dovecot/conf.d/20-imap.conf
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# When mail is moved in or out of the Dovecot Spam folder, re-train using this script
# that sends the mail to spamassassin.
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# from http://wiki2.dovecot.org/Plugins/Antispam
rm -f /usr/bin/sa-learn-pipe.sh # legacy location #NODOC
cat > /usr/local/bin/sa-learn-pipe.sh << EOF;
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cat<&0 >> /tmp/sendmail-msg-\$\$.txt
/usr/bin/sa-learn \$* /tmp/sendmail-msg-\$\$.txt > /dev/null
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rm -f /tmp/sendmail-msg-\$\$.txt
exit 0
EOF
chmod a+x /usr/local/bin/sa-learn-pipe.sh
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# Configure the antispam plugin to call sa-learn-pipe.sh.
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cat > /etc/dovecot/conf.d/99-local-spampd.conf << EOF;
plugin {
antispam_backend = pipe
antispam_spam_pattern_ignorecase = SPAM
antispam_allow_append_to_spam = yes
antispam_pipe_program_spam_args = /usr/local/bin/sa-learn-pipe.sh;--spam
antispam_pipe_program_notspam_args = /usr/local/bin/sa-learn-pipe.sh;--ham
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antispam_pipe_program = /bin/bash
}
EOF
# Tell spamassassin where to load and store site-wide bayesean filtering data.
mkdir -p $STORAGE_ROOT/mail/spamassassin
chown -R spampd:spampd $STORAGE_ROOT/mail/spamassassin
chmod -R 775 $STORAGE_ROOT/mail/spamassassin
tools/editconf.py /etc/spamassassin/local.cf -s \
bayes_path=$STORAGE_ROOT/mail/spamassassin/bayes
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# Initial training?
# sa-learn --ham storage/mail/mailboxes/*/*/cur/
# sa-learn --spam storage/mail/mailboxes/*/*/.Spam/cur/
# Kick services.
restart_service spampd
restart_service dovecot
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