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. 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
New in Rampart 1.0.0
New in 1.0.0