SquidGuard is a URL redirector used to use blacklists with the proxysoftware Squid. There are two big advantages to squidguard: it is fast and it is free.
dspam Training
Training dspam from Thunderbird junk messages
Dovecot Antispam Plugin
Retrain spam message
dspam --user username --source=error --class=spam /path/to/messageClassify a message without training on it:
dspam --user username --classify /path/to/messageDovecot Anti-Spam Plugin
Train dspam simply by moving messages into a Spam folder.
cd /extra/src
wget http://hg.dovecot.org/dovecot-antispam-plugin/archive/tip.tar.gz \
-O dovecot-antispam-plugin.tar.gz
tar zxf dovecot-antispam-plugin.tar.gz
cd dovecot-antispam-plugin-5ebc6aae4d7c
ACLOCAL='aclocal -I /usr/local/share/aclocal' ./autogen.sh
./configure
make
make installEdit /usr/local/etc/dovecot/conf.d/20-imap.conf and add the plugin:
protocol imap {
mail_plugins = $mail_plugins antispam
}Configure the plugin settings in /usr/local/etc/dovecot/conf.d/90-plugins.conf:
antispam_backend = dspam-exec
antispam_signature = X-DSPAM-Signature
antispam_signature_missing = error
antispam_trash = trash;Trash;Deleted Items; Deleted Messages
antispam_spam = Spam
antispam_dspam_binary = /usr/local/bin/dspamc # For our daemonized setup
antispam_dspam_args = --client;--deliver;--user;%u;--source=error;--signature=%%sAlias training issue
Even with MySQLUIDInSignature on set in dspam.conf, the antispam_dspam_args must have --user set to a user that exists in the the MySQL table dspam_virtual_uids.
http://dspam-user.narkive.com/njwX4rau/getting-mysqluidinsignature-to-work-under-3-6-1
https://www.mail-archive.com/dspam-users@lists.nuclearelephant.com/msg00709.html
http://dspam-user.narkive.com/ez7Ct8sc/problems-with-mysqluidinsignature-and-single-spam-alias
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Credits
Various bits of code, scripts, and procedures were put together with information from John Simpson's qmail.jms1.net website. It's an excellent resource on managing and setting up a Qmail server.