You can easily encode mailto and plain email address links on your WordPress site and hide them from spambots. Email Encoder Bundle is a free WordPress plugin that plugin works directly when activated. Simply install and activate it, after activation visit your admin area Dashboard -> Settings -> Email Encoder Bundle plugin option page and check where you want options to take effect like you can enable it on all posts, comments and text widgets. You can set it to automatically encode both mailto and plain email addresses links, you can set class for mailto links and there are few more useful options.
With new WordPress plugin called Comment Auto Blacklist automatically adds IPs of spam comments to comment blacklist settings field in your WordPress site.
6Scan Security is a comprehensive automatic protection for WordPress based websites can get against hackers.The security scanner goes beyond the rule-based protection of other WordPress security plugins, employing active penetration testing algorithms for finding security vulnerabilities in a WordPress install. Then it fixes them then all automatically before hackers can exploit them. The plugin provides you regular updates to ensures your protection is always airtight.
Here is an easy way of monitoring your WordPress site against hacking attacks. Every minute hacking bots attempts logging-in to your WordPress site and when they get successful in doing so, they edit your WordPress files (generally WordPress theme files) then add their Affiliate links and sometimes illegal and harmful programs.
Generally WordPress website owners use CAPTCHA plugins for protecting their site from Spam Bots. This tutorial explains you working of a free WordPress plugin you can use for protecting your WordPress installation from Spam Bots without installing any type of captcha plugin. Keypic.Com is an online service that provides you with free plugins now only for WordPress but for other Opensource blogging platforms like Drupal and next month (as scheduled) they would be launching plugins for Joomla, php. More plugins would be available in the near future for MediaWiki, Typo3, vBulletin. For more information on plugins visit here.