sa-learn-cyrus - Train Spamassassin with spam/ham from user's imap mailboxes
sa-learn-cyrus [ options ] user-name(s)
user-name(s) One ore more user/mailbox name(s).
options:
--help Prints a brief help message and exits.
-h
--man Prints the manual page and exits.
--verbose level Be verbose if level > 0
-v level
--config file Use a configuration file other than the default
-c file one.
--sa-debug Run sa-learn in debug mode.
-d
--simulate Run in simulation mode (show commands only).
-s
--imap-domains domains Search mailboxes in list of domains.
-D domains
sa-learn-cyrus feeds spam and non-spam (ham) messages to Spamassassin's database. Its main purpose is to train SA's bayes database with spam/ham messages sorted by the mailbox owners into special subfolders.
It is intended to be used on smal mail systems (e.g. home office) with a single server-wide SA configuration.
Launching sa-learn-cyrus at regular intervalls (cron job) may improve SA's hit rate considerably, provided that the users are well instructed what to move to their ham/spam folders and what not.
sa-learn-cyrus scans local mail spools as used by Cyrus IMAPd for special subfolders. These subfolders are supposed to contain mails which have been classfied as spam or ham by the mailbox owners.
Example: The users move spam mails which have not been tagged as spam by SpamAssassin (false positives) to a subfolder INBOX.Learn.Spam. Other mails, which may be classified by SA as spam in the future because of certain characteristics are copied to a subfolder INBOX.Learn.Ham.
sa-learn-cyrus feeds the content of these spam/ham folders to SA's Bayes database using the sa-learn tool which is shipped with the Spamassassin package.
Afterwards these mails are deleted (optionally) by means of ipurge which is a helper tool coming along with the Cyrus IMAPd package.
sa-learn-cyrus optionally takes a list of mailbox/user names as agruments:
sa-learn-cyrus fred wilma fritz hjb
If not supplied all mailboxes found will be handled.
All options supplied on the comand line will override corresponding parameters given in the configuration file.
Please note that the basic parameters of sa-learn-cyrus have to be defined in a configuration file. sa-learn-cyrus cannot be controlled solely by means of command.
Use configuration file other then the default one. Always adopt the configuartion file to your needs before using sa-learn-cyrus on a live system. Otherwise you may loose data or corrupt your SA data base!
Specify level of verbosity. (Default = 0)
Run sa-learn in debug mode. This may be useful to examine problems with sa-learn.
Run sa-learn-cyrus in simulation mode. This is useful for first tests after initial configuration or if problem are encountered. In simulation mode sa-learn-cyrus doesn't execute any system commands nor does it touch any data. It just displays what it would do.
If your Cyrus installation uses the "domain support" you may use this option to tell what domains you want to be searched.
--domains example.com,another.org
is equivalent to
[imap] ... domains = example.com another.org ...
in the configuration file.
By default sa-learn-cyrus expects its configuration file as /etc/sapmasassin/sa-learn-cyrus.conf.
One has to change this setting in the code, if another default file is wanted.
Another than the default file can always be choosen with the --config option.
A sample configuration file is shipped with sa-learn-cyrus.
The configuration file has a format as knwon from rsync or samba is very
similar to the format of Windows ini files. The file consist of sequence
sections. The begin of each section is designated with a section name, a word
in square brackets, e.g. [global]. The section entries consist of
parameters, which are key/value pairs each on a single line. Key an value are
separated by an equal sign like
key = value
The value is a single word or a list of words each of them representing a
number or a string. Words may be surrounded ba any number of spaces for better
readability. Empty lines and lines with a leading hash character # are
ingored.
The [global] section contains all global controll parameters.
sa-learn-cyrus creates some temporary files during each run. This is the directory where thes files are created.
To avoid race conditions, sa-learn-cyrus uses a simple file locking mechanism. Each new sa-learn-cyrus process looks for this file before it realy does anything. If this file exists, the process exits with a warning, assuming that another sa-learn-cyrus process is running.
The level of verbosity. Values range from 0 (low) to 3 (high). A reasonable level to start with is 1.
sa-learn-cyrus should be run in simulation mode (simulate = yes) after the
first customization of the configuration to avoid loss of data or corruption
of SA's database in case of wrongly configured parameters.
Section [mailbox] contains all parameters to select the mailboxes, to specify the special subfolders, and to define the actions to apply.
Only spam/ham mails of these mailboxes are fed to Spamassassin's database. If
this List ist empty, all mailboxes will be used. include_list may be used
instead of the list on the command line.
Example:
include_list = fred wilma fritz hjb
If include_list is empty, a regular expression given here is applied to all mailbox names to select mailboxes. This parameter is ignored if include_list is not empty.
Example: Include all mailboxes beginning with 'knf-'.
include_regexp = ^knf-
A list of mailboxes wich will be excluded. If include_list is not empty, this parameter is ignored.
Mailbox names which match with this regular expresson are excluded from processing.
Example: Ignore all mailboxes ending with '.beie'
exclude_regexp = \.beie$
The name of the special subfolder in each mailbox which contains spam. The name should be a complete folder path relative to the root folder INBOX. The Cyrus nomenclature is applied (same as with cyradm).
Example:
spam_folder = Learn.Spam
This is a subfolder in a folder tree like this:
INBOX
+--Drafts
+--Templates
+--Sent
+--Learn
| +--Ham
| +--Spam <-- spam subfolder
|
The name of the special subfolder in each mailbox which contains ham.
(Same naming scheme as with spam_folder, see above.)
Are the spam messages in the spam_folder to be removed after feeding them to
the SA database or not?
Are the ham messages in the ham_folder to be removed after feeding them to
the SA database or not?
Spamassassin (SA) configuration items.
Path to system-wide SA preferences.
Example:
site_config_path = /etc/spamassassin
Path of the system-wide SA configuartin file.
Example:
prefs_file = /etc/spamassassin/local.cf
Path to the sa-learn utility.
Example:
learn_cmd = /usr/bin/sa-learn
The user id SA runs with.
Example:
user = mail
The group id SA runs with.
Example:
group = mail
Run sa-learn in debug mode or not. debug = yes may be useful to examine
problems.
The section [imap] contains the necessary configuration parameter to locate an manage the (Cyrus) IMAPd spool files.
The root of the base directory of the IMAP spool (below that the mailboxes are located).
If base_dir is divided in subdirectories named with the initial letters of
mailbox names set initial_letter = yes (default), otherwise choose no.
Examples for joe's mailbox:
<base_dir>/j/user/joe/ : initial_letter = yes <base_dir>/user/joe/ : initial_letter = no
If your Cyrus spool uses domain hierarchy supply a list of domains. If domain
support is not used leave this entry empty. The initial_letter option (see
above) is applied to domains, too.
Example for mailboxes fritz@bar.org and joe@foo.com :
The mail files within the Cyrus spool are located at
<base_dir>/domain/b/bar.org/f/fritz <base_dir>/domain/f/foo.com/j/joe
List the domains as
domains = foo.com bar.org
Choose unixhierarchysep = yes if Cyrus is configured to accept usernames
like 'hans.mueller.somedomain.tld'. Otherwise set unixhierarchysep = no.
The path to the Cyrus ipurge utility for purging mail messages.
Example:
purge_cmd = /usr/sbin/ipurge
The user Cyrus-IMAPd runs as.
Example:
user = cyrus
/etc/spamassassin/sa-learn-cyrus.conf
sa-learn(1), spamassassin(1), Mail::SpamAssassin(3), imapd(8)
The current version of this script is available at http://www.pollux.franken.de/mail-server-tools/sa-learn-cyrus/
sa-learn (part of the SpamAssassin package), ipurge (part of Cyrus IMAPd)
Hans-Juergen Beie <hjb@pollux.franken.de>
Copyright 2004-2008 by Hans-Juergen Beie.
This program is free software; you can redistribute it and/or modify it under the terms of the Artistic License 2.0 http://foundation.perl.org/legal/licenses/artistic-2_0-plain.html or the GNU General Public License as published by the Free Software Foundation; either version 2 of the license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Thanks to Robert Carnecky and Jan Hauke Rahm for testing and suggestions for the implementation of the domain support.