Prevent people from registering with emails that contain a subdomain to help reduce spam.

Protect your blog from comment spam and blocks other spam attacks in real time.

The most advanced protection against sploggers and spam users registration, is fully WordPress,WordPress MU ,BuddyPress and bbPress 2.0 compatible

Recapture fights user registration spam by placing a reCAPTCHA on the user registration form.

Very effective anti-spam plugin that eliminates comment spam, and registration spam. Combines many effective methods for identifying spammers and keeping them off your site. THe plugin is designed to be very light weight so it will not interfere with the operation of your website. Easy to install and default options work perfectly on most sites. Will not lock you out. No Captchas needed. Works with JetPack Protect.