WP Ban Manager enables you to block ips and users from posting comments to your site
WP Ban Manager was created out of a need to manage bans. Sometimes, when the discussion becomes ugly, you want to temporarily ban people rather than permanently, in order to let them cool down. Or you want to implement a "three strikes you're out" policy. When you have a lot of comments and heated discussions, managing this manually can take a substantial amount of your precious time. WP Ban Manager keeps track of all this for you, so you can focus on more rewarding activities.
As an additional feature, you can also ban comments from the Tor network. In our experience, it was used a lot by banned people to circumvent our bans.
Note: This plugin stores its bans in the WP options table, and as such is not suitable for sites having hundreds of bans simultaneously. If there is a large demand for it (or when people are willing to pay me :-)) I will consider updating this plugin.