A simple and efficient anti-spam plugin
No Spam is a simple, lightweight and efficient anti-spam plugin.
It relies on differences between humans and robots when they visit (or crawl) a page.
As spam bots usually don't kown which fields are required and which are not, they use to fill all the fields. The plugin adds a extra field (with empty value) in the comment form and hide it with CSS styling. After submission, the plugin check if the field is still empty.