Last updated on Sun, 2009-08-09 04:11. Originally submitted by fabio on 2007-04-21 10:05.
UPDATE August 2009: this article is pretty old now. During the past years there have been new stuff coming out, most notably Mollom. I'm currently using it as a spam filtering tool and it's working great. Please take the following consideration as pretty outdated.
During the past weeks this site has been targeted by some bots which posted spam comments.
As soon as the spam comments appeared I started deleting them using Drupal comments administration however, as a spam comment was received every 2-3 hours, this was not an affordable way to keep my website spam free.