Capture them with CAPTCHA
We have all come across a CAPTCHA test at some point or the other and though it may seem annoying as a visitor, this can be a very useful tool to a site administrator. It is that fuzzy image of some text that you have to fill out in a web form and if you’re a legitimate user you can go ahead with submitting your details. This is a decent way to keep some spambots away but it isn’t too difficult for them to find a way out either. Thus, using it as a stand-alone solution is not a very good idea. Installing the Captcha Drupal module is as simple as configuring it.