Rampart is a robust anti-spam tool for MODX Revolution. It can be used to help prevent spam registrations and postings on your MODX Revolution site, as well as provides DNS blacklisting. It requires the PHP extension mcrypt, and the Login Extra version 1.5.2 or later.
Please view the official documentation here:http://rtfm.modx.com/display/ADDON/Rampart
Install via Package Management.
New in Rampart 1.1.0-rc1
New in 1.1.0