Manage the ability of unregistered users to comment sitewide, across the entire network.
When you run a network, blacklisting commenters is handled per-site. That's normally okay, but sometimes people decide to be trolls and spam your whole network. This plugin allows you to ban, spam or moderate an unregistered commenter network wide. It does not replace the per-site blacklists or moderation lists, but simply adds on to it.
When a user posts a comment and they're on the list, they are redirected to the post they just tried to comment on, but their comment has been shunted to the mysterious black hole along with your socks. If you pick 'blackhole', no one will ever see the comment. Pick 'spam' and they go to spam. Pick 'moderate' and the post is forced into moderation.
A sample email of email@example.com is included in the plugin for you to play with.