Spamblocker extracts all the sender ip addresses, where the mail agent returned the "User unknown" error three times and more (this value may be adapted in the spamblocker.h file under SPAMLEVEL). The ip addresses are stored in a temporary block file, which will be deleted via crontab every day. This file is defined in the script spamblocker.sh and is by default /tmp/spamblocker.reject Spamblocker uses this temporary block file and updates the access configuration of the running MTA.
If spamblocker is run the first time, it scans the entire mail log. With every subsequent launch of spamblocker, it starts sanning of the mail log file at the point where it finished the last run. If the line at the file position does not match the last scanned line in the previous run (i.e. after log rotation of the system), spamblocker restarts scanning from the beginning of the file. Spamblocker stores these informations int the file /var/cache/spamblocker/spamblocker.dat
The core programm of spamblocker is written in C and extracts the ip's very fast, even on big log files and is therefore adapted for mail servers with large mail traffic.
1.) tar xvfz spamblocker.tar.gz 2.) cd spamblocker 3.) make 4.) make deb 5.) dpkg -i spamblocker_0.2-0_all.deb
To install spamblocker on another Linux, follow these steps:
1.) tar xvfz spamblocker.tar.gz 2.) cd spamblocker 3.) make 4.) make install
After installation, spamblocker has an entry in the /etc/crontab file, which starts spamblocker every five minutes with the default configuration in /etc/spamblocker.conf.
Spamblocker comes with a default configuration for sendmail. It uses the /var/log/mail file as mail log and updates the access file /etc/main/access.db via makemap and hash class type.
You may alter the configuration for your needs.
If you installed spamblocker on another Linux System, you have to remove the following files manually.
/usr/sbin/spamblocker binary, extracts spammer ip's from given mail log. /usr/sbin/spamblocker.sh script that launches the binary and updates MTA configuration periodically /etc/init.d/spamblocker starts/stops the spamblocker /etc/spamblocker.conf configuration file /etc/cron.daily/spamblocker cron script which deletes temporary block file and rotates spamblocker log files