SpamAssassin is free and open source software used for e-mail spam filtering based on content-matching rules. It is now part of the Apache Foundation.
SpamAssassin uses a variety of spam-detection techniques, that includes DNS- based and fuzzy-checksum-based spam detection, Bayesian filtering, external programs, blacklists and online databases.
The program can be integrated with the mail server to automatically filter all mail for a site.
SpamAssassin is in the Ubuntu software package repository:
$ sudo apt-get --install-suggests install spamassassin
The SpamAssassin system service and the cron-job for daily rule updates rules update aren not enabled by default.
change as follows:
# Change to one to enable spamd ENABLED=1
# Cronjob # Set to anything but 0 to enable the cron job to automatically update # spamassassin's rules on a nightly basis CRON=1
Now start Spamassassin:
$ sudo /etc/init.d/spamassassin start