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

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.