The Stop Spammers Plugin checks comments and logins using many methods to stop spammers.
Just beware that you can be locked out of your own website if your ISP assigns you an IP that has already been blacklisted.
If that happens you will need to login to your website via ftp and rename the plugin's php file.
You can also try switching off your modem and switching it back on again.
We get about 300-400 signup attempts a day, on average only one or two get through. Without this I'd have to remove signups from the site. Essential plugin.
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