Prevent registration and subsequent spam on your Wordpress blog by preventing registration from blacklisted domains and email addresses. Although I am not sure that requiring registration for comments is such a hot idea, this plugin might be useful for those that have set that flag but are still facing spam problems or bogus registrations.

Installation and usage:

1. Download Registration Blacklist plugin and extract to a local folder.
2. Upload extracted file to wp-content/plugins/ folder.
3. Activate from the plugins page in WordPress Admin panel.
4. Go to Options / Registration Blacklist. Selecting this will show a text box. Simply add domains or full email addresses that host email accounts that you don’t want to be used to register a user account.

Registration Blacklist | WPTools

Registration Blacklist, Plugin, WordPress, Blog