WordPress and other application blogs are often abused by spammers. There are a lot of techniques how to spam the blog like for example using the automated scripts or getting human spammers. To avoid it you just need to sign of for Honey pot project which contains thousands of spammers IP addresses.
When you will install your WordPress blog you just need to add simple plugin (httpBL) which will check for spam comments and emails.
1. Sign up at the Project Honey Pot web site.
2. Get your personal httpBL API key.
3. Add the plugin from URL: http://wordpress.org/extend/plugins/httpbl/
4. Install the plugin by following the detailed instructions in our comprehensive tutorial about WordPress plugins installation.
5. Activate the plugin from the WordPress administrator panel. Navigate to Plugins->http:BL. Enter the httpBL API key and set the options to your preference.
6. Check the log at the end of the Plugins->http:BL page. The blocked IPs will be listed there.
Then you can check these IPs at http://www.projecthoneypot.org/search_ip.php. There you will find more information why the IPs are listed as spam sources.