The spam comments your WordPress blog receives are annoying, time consuming and can hurt your search engine rankings. Luckily there are some good and completely free plugins available to help in stopping spam in WordPress.
The first plugin you should consider is Akismet – http://akismet.com/
The Akismet plugin is top quality and great for stopping spam in wordpress. Best of all it is free for personal blog sites. You simply install the plugin and then register for a free access code to enable the plugin.
If you are running a commercial blog and don’t wish to pay the $5 per month Akismet commercial fee, then your best choice for a free anti-spam WordPress plugin is Antispam Bee – http://wordpress.org/plugins/antispam-bee/
The Antispam Bee plugin is completely free and very well supported. Like most things made in Germany it is engineered very well and is amazing at stopping spam in WordPress. To install Antispam Bee, go to Plugins, Add New and search for “antispam bee” – install and activate.