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[squirrelmail.git] / plugins / filters / README
1 Filters Plugin
4 ------------
5 This plugin sorts messages in your inbox into different folders based upon
6 given criteria. It is most useful for people who are subscribed to mailing
7 lists to help organize their messages. The argument stands that filtering is
8 not the place of the client, which is why this has been made a plugin for
9 SquirrelMail. You may be better off using products such as Sieve, Maildrop or
10 Procmail to do your filtering so it happens even when SquirrelMail isn't
11 running.
13 IMPORTANT: At least one version of PHP has bugs in the checkdnsrr() function
14 that the SPAM filtering code RELIES ON. The PHP server that comes with Mandrake
15 8.1 has this problem -- checkdnsrr() NEVER finds the inaddr records, even the
16 ones that really exist.
18 This is a poor alternative to procmail or Elm's filter programs. This is a
19 pathetic replacement for good RBL mail scanning when you get the mail. This is
20 more for systems that can't/won't offer that kind of functionality and you
21 still require it.
23 This is slow. Yep. Slow.
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27 Plugin is installed by enabling it in SquirrelMail configuration script.
28 Plugin configuration can be changed with configuration files stored in
29 config/filters_config.php or plugins/filters/config.php. Default configuration
30 values can be found in plugins/filters/config_default.php. If both
31 configuration files are present, plugin uses file from config directory.
33 Main configuration option that must be changed is $SpamFilters_YourHop setting.
34 See comments about it in config_default.php. If $SpamFilters_YourHop uses
35 default value, plugin will be unable to use RBL filtering correctly and
36 warning message will is displayed to end user. If you don't want to use RBL
37 filtering, you can disable it by setting $AllowSpamFilters option to false. If
38 you can control your incoming SMTP server, it is recommended to turn RBL
39 filtering on server.
41 If you use UW and if you encounter strange errors while using this plugin on
42 your system, edit configuration file and set $UseSeparateImapConnection to
43 true. This may not solve the problem. One problem it might fix is if you run UW
44 2001 and if you don't see the number of unread messages in your left-hand
45 folder pane, or if you see timeouts or IMAP server error messages. Turning on
46 this feature may slow down the filters a bit more since it has to open a new
47 connection.
49 Lastly, if there are some IPs that you want to refuse email from or some IPs
50 you want to accept email from REGARDLESS of what the DNS databases say, you can
51 put in overrides in the SpamFilters_DNScache[] array. See the comments in
52 config_default.php for more info on this.