Akismet is an anti-spam WordPress Plugin and a favourite with all Internet Business Consultants as it checks all the comments you get with their very own web service and filters out spam comments. The Plugin provide status history of each comment for the webmaster’s review. Any hidden or misleading URLs are also revealed in comment body. This Plugin automates filtering comments that appears to be spam while checking through all the comments received.
The personal blogs can use Akismet free API Key and the commercial and business site need to opt paid subscription. Now you can block the spam out of your website and thus save your disk space and enhance your website speed.
Read more here > Akismet