Stopping SPAM and fake signups with mod_defensible and Apache on Ubuntu

Want to stop users from known blacklisted IP’s from accessing your site? Well, mod_definsible is the apache module for you. Here’s how to install it on Ubuntu:

sudo apt-get install libapache2-mod-defensible

then to enable the module do:

a2enmod defensible

Now create a file in /etc/apache2/mods-available/defensible.conf and put the following couple of lines in it:

DnsblUse On
DnsblServers xbl-bl.spamhaus.org. mydnbl.server.org.

Now restart apache and you’re all set. Now whenever a user that’s on spamhaus’s blocklist tries to access your site, they get a 403 Forbidden page.