# 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. The tools/mail.py tool creates the necessary sieve script for each mail # user when the mail user is created. source scripts/functions.sh # load our functions # Install packages. apt_install spampd razor pyzor dovecot-sieve dovecot-antispam # Allow spamassassin to download new rules. tools/editconf.py /etc/default/spamassassin \ CRON=1 # Configure pyzor. pyzor discover # Hook into postfix. Replace dovecot with spampd as the mail delivery agent. tools/editconf.py /etc/postfix/main.cf virtual_transport=lmtp:[127.0.0.1]:10025 # 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. tools/editconf.py /etc/default/spampd DESTPORT=10026 # Enable the Dovecot sieve plugin which let's us set a script that automatically moves # spam into the user's Spam mail filter. # (Note: Be careful if we want to use multiple plugins later.) sudo sed -i "s/#mail_plugins = .*/mail_plugins = \$mail_plugins sieve/" /etc/dovecot/conf.d/20-lmtp.conf # 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.) sudo sed -i "s/#mail_plugins = .*/mail_plugins = \$mail_plugins antispam/" /etc/dovecot/conf.d/20-imap.conf # When mail is moved in or out of the Dovecot Spam folder, re-train using this script # that sends the mail to spamassassin. # from http://wiki2.dovecot.org/Plugins/Antispam cat > /usr/bin/sa-learn-pipe.sh << EOF; cat<&0 >> /tmp/sendmail-msg-\$\$.txt /usr/bin/sa-learn \$* /tmp/sendmail-msg-\$\$.txt > /dev/null rm -f /tmp/sendmail-msg-\$\$.txt exit 0 EOF chmod a+x /usr/bin/sa-learn-pipe.sh # Configure the antispam plugin to call sa-learn-pipe.sh. 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/bin/sa-learn-pipe.sh;--spam antispam_pipe_program_notspam_args = /usr/bin/sa-learn-pipe.sh;--ham antispam_pipe_program = /bin/bash } EOF # Initial training? # sa-learn --ham storage/mail/mailboxes/*/*/cur/ # sa-learn --spam storage/mail/mailboxes/*/*/.Spam/cur/ # Kick services. sudo service spampd restart sudo service dovecot restart