antispam plugin, pipe backend, how to make it work?
johannes at rohr.org
Tue Apr 12 18:14:30 UTC 2016
Hi, my setup is a dovecot 2.0.19 IMAP server on Ubuntu Precise with
the antispam plugin in version 2.0+20120225-2 and spamassassin at
I have been trying and failed to get the pipe backend of the antispam
plugin to work. Spamassin by itself works, a manual call of sa-learn
works fine. Bayes data is stored in a mysql DB.
I have the following configuration in /etc/dovecot/conf.d/90-plugin.conf
#setting_name = value
antispam_pipe_program_spam_arg = --spam
antispam_pipe_program_notspam_arg = --ham
antispam_pipe_program = /usr/local/bin/sa-learn-pipe.sh
antispam_pipe_program_args = --username=%u # % expansion done by
antispam_trash = trash;Trash;Deleted Items;Deleted Messages
antispam_spam = SPAM;Junk
antispam_backend = pipe
antispam_verbose_debug = 1
antispam_debug_target = syslog
antispam_pipe_tmpdir = /tmp
I have tried the following wrapper script:
# set -x
echo "$$-start ($*)" >> $LOGFILE
#echo $* > /tmp/sendmail-parms.txt
cat<&0 >> /tmp/sendmail-msg-$$.txt
/usr/bin/sa-learn $* -D /tmp/sendmail-msg-$$.txt >> $LOGFILE 2>&1 && \
rm -f /tmp/sendmail-msg-$$.txt
echo "$$-end" >> $LOGFILE
It somehow isn't working. I can call the wrapper script manually e.g.
sudo -u vmail /usr/local/bin/sa-learn-pipe.sh --username=some at mail.user
But it doesn't work from dovecot. It seems the script is called. but no
new patterns show up in the bayes DB. Unfortunately, the plugin seems to
be documented poorly. How does it call the programme it pipes to? Is it
something like $programme --par1 --par2 < message ? Why can't /
shouldn't I call sa-learn directly? All the instructions I found on the
in internet contained a wrapper script, but none bothered to explain why
you would actually need it.
I would be very grateful, if someone could enlighten me on that...
More information about the dovecot