Filtering spam mails with bogofilter22.03.2020 by Dirk Olmes
I’m running a Postfix server here at home to process incoming mail. To integrate spam filtering I’m delivering mails via procmail - it’s as simple as setting
mailbox_command = /usr/bin/procmail in postfix’
Spam filtering works by invoking the filter (bogofilter in my case) from procmail like this:
:0 fw | /usr/bin/bogofilter -uep
This command will pipe the mail content through bogofilter which will add a
X-Bogosity header denoting the spam status of the mail.
A second procmail rule moves all spam to a designated spam folder on my IMAP server:
:0 * ^X-Bogosity: Spam.* $HOME/.maildir/.INBOX.Spam/
For training I use two designated folders on my IMAP server: LearnSpam and LearnGood. I’m simply moving mails that I want to train as spam to the LearnSpam folder. Once per hour I train spam/good mails using this script:
#!/bin/bash SPAM_FOLDER=$HOME/.maildir/.INBOX.Spam.LearnSpam if [[ -d $SPAM_FOLDER ]]; then SPAM_CUR=$SPAM_FOLDER/cur # only invoke bogofilter if there are mails in the folder if [[ "$(ls -A $SPAM_CUR)" ]]; then /usr/bin/bogofilter -s -B $SPAM_FOLDER && rm $SPAM_CUR/* fi fi HAM_FOLDER=$HOME/.maildir/.INBOX.Spam.LearnGood if [[ -d $HAM_FOLDER ]]; then HAM_CUR=$HAM_FOLDER/cur # only invoke bogofilter if there are mails in the folder if [[ "$(ls -A $HAM_CUR)" ]]; then /usr/bin/bogofilter -n -B $HAM_FOLDER && rm $HAM_CUR/* fi fi
The script is invoked via cron.
There are no comments yet.