Mail::SpamAssassin::Plugin::AWL
Mail::SpamAssassin::Plugin::AWL
NAMESYNOPSIS
DESCRIPTION
TEMPLATE TAGS
USER PREFERENCES
ADMINISTRATOR SETTINGS
NAME
Mail::SpamAssassin::Plugin::AWL − Normalize scores via auto−whitelist
SYNOPSIS
To try this out, add this or uncomment this line in init.pre:
loadplugin Mail::SpamAssassin::Plugin::AWL
Use the supplied 60_awl.cf file (ie you don’t have to do anything) or add these lines to a .cf file:
header AWL eval:check_from_in_auto_whitelist()
describe AWL From: address is in the auto white−list
tflags AWL userconf noautolearn
priority AWL 1000
DESCRIPTION
This plugin module provides support for the auto-whitelist. It keeps track of the average SpamAssassin score for senders. Senders are tracked using a combination of their From: address and their IP address. It then uses that average score to reduce the variability in scoring from message to message and modifies the final score by pushing the result towards the historical average. This improves the accuracy of filtering for most email.
TEMPLATE TAGS
This plugin module adds the following "tags" that can be used as placeholders in certain options. See "Mail::SpamAssassin::Conf" for more information on TEMPLATE TAGS .
_AWL_ AWL modifier
_AWLMEAN_ Mean score on which AWL modification is based
_AWLCOUNT_ Number of messages on which AWL modification is based
_AWLPRESCORE_ Score before AWL
USER PREFERENCES
The following
options can be used in both site-wide
("local.cf") and user-specific
("user_prefs") configuration files to
customize how SpamAssassin handles incoming email messages.
use_auto_whitelist ( 0 | 1 ) (default: 1)
Whether to use auto-whitelists. Auto-whitelists track the long-term average score for each sender and then shift the score of new messages toward that long-term average. This can increase or decrease the score for messages, depending on the long-term behavior of the particular correspondent.
For more information about the auto-whitelist system, please look at the the "Automatic Whitelist System" section of the README file. The auto-whitelist is not intended as a general-purpose replacement for static whitelist entries added to your config files.
Note that certain tests are ignored when determining the final message score:
− rules with tflags set to 'noautolearn'
auto_whitelist_factor n (default: 0.5, range [0..1])
How much towards the long-term mean for the sender to regress a message. Basically, the algorithm is to track the long-term mean score of messages for the sender ("mean"), and then once we have otherwise fully calculated the score for this message ("score"), we calculate the final score for the message as:
"finalscore" = "score" + ("mean" − "score") * "factor"
So if "factor" = 0.5, then we’ll move to half way between the calculated score and the mean. If "factor" = 0.3, then we’ll move about 1/3 of the way from the score toward the mean. "factor" = 1 means just use the long-term mean; "factor" = 0 mean just use the calculated score.
auto_whitelist_ipv4_mask_len n (default: 16, range [0..32])
The AWL database keeps only the specified number of most-significant bits of an IPv4 address in its fields, so that different individual IP addresses within a subnet belonging to the same owner are managed under a single database record. As we have no information available on the allocated address ranges of senders, this CIDR mask length is only an approximation. The default is 16 bits, corresponding to a former class B. Increase the number if a finer granularity is desired, e.g. to 24 (class C) or 32. A value 0 is allowed but is not particularly useful, as it would treat the whole internet as a single organization. The number need not be a multiple of 8, any split is allowed.
auto_whitelist_ipv6_mask_len n (default: 48, range [0..128])
The AWL database keeps only the specified number of most-significant bits of an IPv6 address in its fields, so that different individual IP addresses within a subnet belonging to the same owner are managed under a single database record. As we have no information available on the allocated address ranges of senders, this CIDR mask length is only an approximation. The default is 48 bits, corresponding to an address range commonly allocated to individual (smaller) organizations. Increase the number for a finer granularity, e.g. to 64 or 96 or 128, or decrease for wider ranges, e.g. 32. A value 0 is allowed but is not particularly useful, as it would treat the whole internet as a single organization. The number need not be a multiple of 4, any split is allowed.
user_awl_sql_override_username
Used by the SQLBasedAddrList storage implementation.
If this option is set the SQLBasedAddrList module will override the set username with the value given. This can be useful for implementing global or group based auto-whitelist databases.
auto_whitelist_distinguish_signed
Used by the SQLBasedAddrList storage implementation.
If this option is set the SQLBasedAddrList module will keep separate database entries for DKIM-validated e−mail addresses and for non-validated ones. A pre-requisite when setting this option is that a field awl.signedby exists in a SQL table, otherwise SQL operations will fail (which is why we need this option at all − for compatibility with pre−3.3.0 database schema). A plugin DKIM should also be enabled, as otherwise there is no benefit from turning on this option.
ADMINISTRATOR SETTINGS
These settings
differ from the ones above, in that they are considered
’more privileged’ -- even more than the ones in
the PRIVILEGED SETTINGS section. No
matter what "allow_user_rules" is set to,
these can never be set from a user’s
"user_prefs" file.
auto_whitelist_factory module (default:
Mail::SpamAssassin::DBBasedAddrList)
Select alternative whitelist factory module.
auto_whitelist_path
/path/filename (default:
~/.spamassassin/auto−whitelist)
This is the automatic-whitelist directory and filename. By default, each user has their own whitelist database in their "~/.spamassassin" directory with mode 0700. For system-wide SpamAssassin use, you may want to share this across all users, although that is not recommended.
|
auto_whitelist_db_modules Module ... |
(default: see below) |
What database modules should be used for the auto-whitelist storage database file. The first named module that can be loaded from the perl include path will be used. The format is:
PreferredModuleName SecondBest ThirdBest ...
ie. a space-separated list of perl module names. The default is:
DB_File GDBM_File SDBM_File
NDBM_File is no longer supported, since it appears to have bugs that preclude its use for the AWL (see SpamAssassin bug 4353).
auto_whitelist_file_mode (default: 0700)
The file mode bits used for the automatic-whitelist directory or file.
Make sure you specify this using the ’x’ mode bits set, as it may also be used to create directories. However, if a file is created, the resulting file will not have any execute bits set (the umask is set to 111).
user_awl_dsn DBI:databasetype:databasename:hostname:port
Used by the SQLBasedAddrList storage implementation.
This will set the DSN used to connect. Example: "DBI:mysql:spamassassin:localhost"
user_awl_sql_username username
Used by the SQLBasedAddrList storage implementation.
The authorized username to connect to the above DSN .
user_awl_sql_password password
Used by the SQLBasedAddrList storage implementation.
The password for the database username, for the above DSN .
user_awl_sql_table tablename
Used by the SQLBasedAddrList storage implementation.
The table user auto-whitelists are stored in, for the above DSN .
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
