71 lines
2.7 KiB
Bash
71 lines
2.7 KiB
Bash
# Spam filtering with spamassassin via spampd
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#############################################
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# spampd sits between postfix and dovecot. It takes mail from postfix
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# over the LMTP protocol, runs spamassassin on it, and then passes the
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# message over LMTP to dovecot for local delivery.
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# In order to move spam automatically into the Spam folder we use the dovecot sieve
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# plugin. The tools/mail.py tool creates the necessary sieve script for each mail
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# user when the mail user is created.
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source scripts/functions.sh # load our functions
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# Install packages.
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apt_install spampd razor pyzor dovecot-sieve dovecot-antispam
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# Allow spamassassin to download new rules.
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tools/editconf.py /etc/default/spamassassin \
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CRON=1
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# Configure pyzor.
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pyzor discover
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# Hook into postfix. Replace dovecot with spampd as the mail delivery agent.
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tools/editconf.py /etc/postfix/main.cf virtual_transport=lmtp:[127.0.0.1]:10025
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# Pass messages on to docevot on port 10026.
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# This is actually the default setting but we don't want to lose track of it.
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# We've already configured Dovecot to listen on this port.
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tools/editconf.py /etc/default/spampd DESTPORT=10026
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# Enable the Dovecot sieve plugin which let's us set a script that automatically moves
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# spam into the user's Spam mail filter.
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# (Note: Be careful if we want to use multiple plugins later.)
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sudo sed -i "s/#mail_plugins = .*/mail_plugins = \$mail_plugins sieve/" /etc/dovecot/conf.d/20-lmtp.conf
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# Enable the Dovecot antispam plugin to detect when a message moves between folders so we can
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# pass it to sa-learn for training. (Be careful if we use multiple plugins later.)
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sudo 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
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# that sends the mail to spamassassin.
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# from http://wiki2.dovecot.org/Plugins/Antispam
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cat > /usr/bin/sa-learn-pipe.sh << EOF;
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cat<&0 >> /tmp/sendmail-msg-\$\$.txt
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/usr/bin/sa-learn \$* /tmp/sendmail-msg-\$\$.txt > /dev/null
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rm -f /tmp/sendmail-msg-\$\$.txt
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exit 0
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EOF
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chmod a+x /usr/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;
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plugin {
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antispam_backend = pipe
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antispam_spam_pattern_ignorecase = SPAM
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antispam_allow_append_to_spam = yes
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antispam_pipe_program_spam_args = /usr/bin/sa-learn-pipe.sh;--spam
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antispam_pipe_program_notspam_args = /usr/bin/sa-learn-pipe.sh;--ham
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antispam_pipe_program = /bin/bash
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}
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EOF
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# Initial training?
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# sa-learn --ham storage/mail/mailboxes/*/*/cur/
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# sa-learn --spam storage/mail/mailboxes/*/*/.Spam/cur/
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# Kick services.
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sudo service spampd restart
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sudo service dovecot restart
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