This guide tell you how to use Contact Form 7 Blacklist to build a Contact Form 7 spam filter.
Maybe you have already enabled reCAPTCHA on your form, but some real humans submitted spam messages because they filled in the reCAPTCHA. These messages are about chance to earn XXX million dollars, selling cheap SEO, outsourcing services and someone want to tell you an interesting news.
Because these spam messages have common keywords, such as "outsource", "outsourcing", "SEO", "interesting thing", "interesting news" or "a chance to earn". Then you may use Contact Form 7 Blacklist to block those messages.
How to setup it as a Contact Form 7 Spam Filter?
After you apply blacklist to form field then validation message will be shown if users input match your item.
Block when submit form
Purchase Contact Form 7 Blacklist