Although captcha adds an extra step for genuine users registering, it saves me from spending 20-30 minutes a day deleting spam accounts. For genuine users, it only takes about 5 seconds longer to complete the captcha and they only have to do it one time, so the benefit is far worth it! Now I can devote 20-30 minutes extra to customer support or adding new features to the site, rather than to deleting needless accounts.
This tutorial will walk you through step-by-step how to protect your Joomla site registration from spammers by using EasyCalcCheck PLUS’ captcha. (http://extensions.joomla.org/extensions/access-a-security/site-security/captcha/11964 )
You can download the plugin from here.
Access your administrative backend, then go to Extensions >> Install/Uninstall.
Upload the EacyCalcCheck Plus plugin, then click on…