Allows more control over site registration by adding managed groups of invitation codes.
Block users using blacklists domain from registering to your WordPress site.
The most advanced protection against sploggers and spam users registration, is fully WordPress, WordPress MU, BuddyPress and bbPress 2.0 compatible
The ultimate plugin and service to stop and kill splogs in WordPress Multisite and BuddyPress, from WPMU DEV.
WangGuard - Wysija Newsletter Connector is a plugin for connect WangGuard plugin with Wysija Newsletter.
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