Not sure how it’s working, but it’s working great so far!

Most of the popular spam filters don’t block manual entries. I used to use another plugin that lets you manually choose to block an IP address if you determine that it’s spam, and that was semi useful, but took too much time monitoring. We had a client who was getting 5-10 spam messages a day and we installed this and it stopped. They are still getting legitimate messages but the spam has stopped. We’re still monitoring it to see if this keeps up, but so far this is a miracle worker. Thanks for whoever made this plugin!