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How to block form spam on your website

26 November, 2023 · 5 min read·Client intake
How to block form spam on your website
Learn effective strategies to protect your website from annoying form spam with our comprehensive blog post. Discover how to easily block unwanted submissions and keep your online forms spam-free.

As website owners and administrators, we understand the frustration and time wasted dealing with unwanted spam submissions through contact forms. These unsolicited messages not only clutter your inbox but also pose potential security threats

We'll explain why Contact Form 7 is especially prone to spam and provide effective ways to prevent it. Use the tips and techniques in this article to protect your website and save time dealing with spam. Let's dive in and take control of your contact forms!

What is contact form spam?

Contact form spam can be a major headache for website owners. It refers to the unsolicited messages or submissions received through contact forms on websites. These spam submissions are not only annoying but can also lead to a cluttered inbox, waste valuable time, and even pose security risks. In this blog post, we will explore various strategies and techniques to effectively block form spam on your website, particularly focusing on the popular contact form plugin, Contact Form 7.

Contact Form 7 is one of the most widely used form plugins for WordPress websites. While it offers a range of features and flexibility, it is also susceptible to spam submissions. This is because contact forms are an attractive target for spammers who use automated bots to fill out forms with irrelevant or malicious content. Understanding and addressing this threat is crucial to maintaining a smooth and hassle-free contact form experience for both you and your website visitors. 

Why Contact Form 7 is prone to spam

Contact Form 7 is a popular form builder plugin for WordPress that allows website owners to create and manage contact forms easily. However, like most online forms, Contact Form 7 is vulnerable to spam attacks.

Spammers often target contact forms because they provide a direct communication channel with website owners or administrators. This can be exploited for various purposes, such as promoting unsolicited products or services, spreading phishing links, or even injecting malicious code. 

Contact Form 7, being widely used, attracts a considerable amount of automated spam bots that scour the internet for vulnerable forms to exploit. These bots are designed to bypass security measures, fill out forms automatically, and inundate recipients with spam emails. Thus, it is crucial to understand the vulnerabilities of Contact Form 7 and implement effective anti-spam measures to protect your website and preserve the integrity of your contact form submissions.

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Implementing Akismet anti-spam for Contact Form 7

Akismet is a powerful anti-spam plugin that can effectively block form spam on your website. To get started, you'll need to install and activate the Akismet plugin on your WordPress website. Once activated, navigate to the Akismet settings page and ensure that your API key is entered correctly.

Next, open the Contact Form 7 settings page and go to the 'Akismet' tab. Enable the 'Use Akismet to Filter Spam' option, and you're all set. Akismet will now analyze each form submission for potential spam and filter them out before they reach your inbox.

It is important to note that using Akismet does require an API key, which is available for free for personal websites. For commercial websites or those with higher volumes of traffic, there are paid plans available that offer additional features and support. Overall, implementing Akismet anti-spam for Contact Form 7 is a reliable and hassle-free way to block form spam and keep your inbox spam-free.

Additional anti-spam measures for Contact Form 7

Contact Form 7 is a widely used plugin for WordPress websites, but it is also a popular target for spammers. While Akismet Anti-Spam provides a great first line of defense, implementing additional measures can further enhance your spam prevention efforts.


One effective method to deter spam bots from submitting forms is by adding a CAPTCHA or reCAPTCHA to your Contact Form 7. CAPTCHAs are usually simple tests like solving a math problem or typing in distorted characters, while reCAPTCHA uses advanced algorithms to identify human users. By adding these features to your forms, you create an extra layer of security that ensures only genuine users can successfully submit and access your content.

Implement IP address blocking

Another strategy to combat contact form spam is by blocking IP addresses associated with known spammers. This can be done by utilizing security plugins or functions within your content management system. By maintaining a blacklist of IP addresses, you can prevent spammers from accessing your website or submitting spam through your contact forms. Regularly updating the list ensures that you stay ahead of new spamming tactics and keep your website secure.

By combining these additional anti-spam measures with Akismet Anti-Spam, you can significantly reduce the amount of spam that reaches your inbox and maintain the integrity of your website's contact forms.

Protecting contact forms on popular CMS platforms

One of the most popular CMS platforms, WordPress, offers various plugins that can effectively protect contact forms from spam. In addition to implementing Akismet Anti-Spam, WordPress users can also take advantage of plugins like Anti-Spam Bee, WP-SpamShield, or reCAPTCHA. These plugins offer advanced spam filtering capabilities and help prevent unwanted submissions on contact forms.

For users on Drupal, the Contact Form Spam Protection module can be installed to block form spam. This module provides configurable settings to add additional security measures to contact forms, such as enabling CAPTCHA verification or requiring a site administrator to review and approve submissions.

Joomla users can utilize the built-in CAPTCHA plugin to protect contact forms from spam. By enabling CAPTCHA, website owners can ensure that only human users can submit information through the contact form, effectively blocking automated spam bots. Additionally, Joomla users can explore third-party extensions specifically designed to prevent contact form spam, such as OS Anti Spam. These extensions offer versatile options to enhance spam protection and maintain the integrity of contact forms.

Effective strategies to prevent contact form spam

Contact form spam can be a major nuisance for website owners, but with the right strategies in place, it can be effectively prevented. By implementing measures such as Akismet Anti-Spam and additional anti-spam measures, website owners can significantly reduce the amount of spam they receive through their contact forms. These tools help filter out malicious and irrelevant messages, ensuring that only legitimate inquiries reach the website owner.

Furthermore, it is essential to take into account the content management system (CMS) being used. Popular CMS platforms like WordPress, Drupal, and Joomla offer specific plugins and features to protect contact forms from spam. Website owners should take advantage of these resources to safeguard their contact forms. With a combination of these measures, website owners can successfully block form spam and maintain a clean and secure website environment for their visitors.

Online forms made easy with B12

Having a secure site and a convenient form software is crucial, especially if you want to attract more customers to your business. With B12, we offer a client intake form solution that helps you qualify prospects at the onset. Say goodbye to onboarding processes that are inefficient! 

You can customize your client intake forms for branding consistency. Our intuitive interface makes it easy for users to add forms to their website and tailor them accordingly. Try B12 today to make online forms a breeze. 

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