The WP Spam Blacklister is a simple spam-prevention plugin that adds the IP address of a marked spam post on WordPress' comments blacklist.
Great plugin here...I've been marking spam on my blog for years, then installed this plugin. It went through and blacklisted all the spammers that had visited my site, resulting in a sudden massive drop in spam.
Might be a little too aggressive for some, but I have a zero-tolerance policy on spam and this plugin enforces it.
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