Aastha Shaw / Updated: July 9, 2025

How To Stop Invalid & Spam Submissions on HubSpot Forms (2025 Guide)

Preventing spam submissions on HubSpot forms

If you are looking for a simple solution to prevent spam submissions on your HubSpot Forms, this guide is just for you!

HubSpot, a leading marketing and sales platform, boasts millions of active users, and its easy-to-use forms are a cornerstone of its popularity.

But, do you ever feel like your forms are being used by robots instead of real people?

You're not alone!

Fake leads and "spam bots" are a major headache for marketers.

They waste your time, clutter your data, and make it hard to understand your audience.

So, today we will delve into the common challenges faced due to spam submissions and share the easiest yet most effective way to STOP SPAM BOTS from ruining your HubSpot CRM or database.

Let’s get started…

Table of Content:

● What Spam Submissions Look Like in 2025
● Form Spam vs HubSpot Forms
● Problems Caused by Spam Form Submissions: A Growing Pain for Marketers
● What HubSpot Offers Natively to Stop Spam Form Submissions
● Immediate Solution To Stop Spam Submissions On Your HubSpot Forms
● Benefits of using Clearout JavaScript Widget 3 With HubSpot
● Pro Tip: Use Real-time Validation + Progressive Profiling
● Final Thoughts: Stop Spam Without Stopping Conversions
● FAQs

What Spam Submissions Look Like in 2025

Spam bots and fake lead generators have grown smarter.

In 2025, you’re not just dealing with gibberish emails like "[email protected]" or obvious bot names like "asdf qwer." You’re also up against:

AI-generated fake personas with valid-sounding names
Disposable email addresses that bypass basic filters
Repeated entries that clutter analytics and confuse marketing automation
Stolen or spoofed emails used to trigger phishing workflows

These threats are more dangerous than ever. For example, 20% of marketing-qualified leads (MQLs) collected through gated content are now estimated to be either fake or low-quality — skewing campaign performance, harming sender reputation, and inflating CRM costs.

Form Spam vs HubSpot Forms

HubSpot forms are an indispensable tool for capturing leads on your website, landing pages, or in your email campaigns.

While the convenience that HubSpot offers attracts businesses of all sizes, it also attracts unwanted visitors - spambots & abusers. These submissions often come in a predictable pattern, with nonsensical data, disposable and gibberish emails, or stolen information.

This leads to a frustrating influx of fake leads that clog your database and waste your time.

Problems Caused by Spam Form Submissions: A Growing Pain for Marketers

Let’s break down the real-world impact:

Wasted Time & Resources
Sales teams waste hours chasing ghost leads, and marketing teams spend time cleaning data instead of nurturing qualified prospects.
Polluted Analytics
Fake form distorts campaign performance data, making it difficult to measure true ROI or personalize follow-ups.
Compliance & Legal Risk
GDPR, CCPA, and other regulations require handling real user data with care. Allowing fake or malicious entries can raise compliance concerns, especially when sensitive fields are involved.
Increased Form Abandonment
If you try to fight spam using traditional CAPTCHA challenges, you risk frustrating real users. A poor form experience often leads to higher drop-off rates.

So, how do we fix this?

What HubSpot Offers Natively to Stop Spam Form Submissions

HubSpot offers some default measures to stop spam activities on the form. Let’s have a look at those…

1. Google reCAPTCHA (v3)

HubSpot offers some basic protection against spam bots by allowing you to enable CAPTCHA on your forms:

Go to Marketing > Lead Capture > Forms
Edit the form
Under "Other Form Elements," toggle on CAPTCHA
Click "Update" or "Publish"

Once enabled, HubSpot uses Google’s invisible reCAPTCHA v3.

If Google determines that a visitor is suspicious, they must solve a CAPTCHA challenge before they can submit the form.

While this can deter simple bots, it also adds an extra hurdle for human users, potentially decreasing your conversion rate.

Limitations with this method:

Bots are evolving to bypass reCAPTCHA, especially invisible versions.
False positives sometimes block real users.
UX trade-offs: Users might still be presented with image or checkbox challenges, increasing friction.

Why Not Just Use CAPTCHA?

Let’s compare:

Feature	CAPTCHA	Clearout
Stops bots	Partially	Yes (validated)
User friction	High	None
Detects real-time mailbox validity	No	Yes
Detects duplicate or incomplete submissions	No	Yes
GDPR/CCPA alignment	Indirect	Yes

2. Blocking Disposable Domains

System abusers often use temporary or disposable email addresses to pass through forms which leads to invalid and spammy leads in your system.

To stop such signups, HubSpot has a list of disposable domains that are blocked by default. While this can help prevent obvious spam, it has key limitations:

Not updated in real-time — many new disposable services can slip through
Doesn’t validate mailbox status, syntax, or domain activity
Cannot detect malicious intent — only domain pattern

3. Advanced Bot Protection (Enterprise Tier Only)

HubSpot now offers enhanced bot filtering for high-tier accounts. However, it’s not available to most users and still lacks real-time field validation.

TL;DR: Native protection is reactive, limited, and doesn't solve the core issue — poor data quality at the point of capture.

Hence, you can not completely rely on the default validation and blocks to completely get rid of spam submissions.

Immediate Solution To Stop Spam Submissions On Your HubSpot Forms

The ideal solution to proactively prevent spam submissions on HubSpot forms is to verify every submission in real time before they enter your system.

Here's where Clearout shines.✨

Clearout integrates seamlessly with HubSpot forms, validating email addresses, phone numbers and names in real time as they are submitted.

👉 Here’s how you can integrate Clearout with your Hubspot forms:

Benefits of using Clearout JavaScript Widget 3 With HubSpot

Higher Lead Quality
Stop bad data at the door. Only qualified leads with real inboxes make it into your system.
Improved Campaign ROI
No wasted drip campaigns or follow-ups on fake addresses. Your marketing spend becomes more efficient.
Better UX (No CAPTCHA!)
Clearout works invisibly. Your users fill out the form as usual — no puzzles, no boxes to tick.
Cleaner CRM = Accurate Analytics
Duplicate entries, junk data, and invalid emails are automatically flagged or removed.
Form Validation Errors
Clearout's real-time validation prompts users to correct errors and typos at point-of-capture, reducing form abandonment rates.
Compliance Confidence
With accurate data, your email marketing remains compliant and less likely to hit spam traps.
Works with All HubSpot Forms
Whether its legacy (v3) or newer embedded forms, Clearout provides plug-and-play compatibility.

Pro Tip: Use Real-time Validation + Progressive Profiling

One of the smartest ways to reduce form fatigue and keep your data clean is to combine Clearout’s real-time email validation with HubSpot’s progressive profiling feature.

What is Progressive Profiling?

HubSpot allows you to gradually collect information from leads over multiple interactions.

Instead of overwhelming users with a long form on the first visit, you show only the most essential fields — like Name and Email — up front.

Then, when the user returns or fills out another form, additional fields (e.g., Company, Role, Phone Number) appear based on what’s already been captured.

Why Combine It with Clearout?

Because Clearout validates the email in real time, you can instantly verify that the lead is legitimate before asking them for more information. This avoids wasting time on users who submit fake or disposable emails — and ensures that only real users see the rest of the form.

✅ Benefits:

Reduced Form Abandonment: Shorter forms = higher completion rates
Smarter Data Collection: You build a complete profile without overwhelming users
Cleaner CRM: Invalid emails never make it to the next stage
Optimized Lead Nurturing: Each follow-up interaction feels more tailored
Segmentation Accuracy: Better data lets you segment based on valid, progressive inputs

Use progressive fields only after email validation passes.

This ensures your CRM doesn’t get filled with partial entries from fake leads. Pairing Clearout + HubSpot in this way creates a seamless experience that benefits both marketers and users.

Final Thoughts: Stop Spam Without Stopping Conversions

The battle against spam isn’t about making users solve puzzles. It’s about smarter automation, cleaner data, and a smoother journey.

While HubSpot offers basic protection, tools like Clearout are essential to ensure your marketing team works with real, usable, qualified leads — not junk.

Don’t wait for another batch of fake demo requests or invalid newsletter signups to ruin your next campaign.

Start filtering spam submissions today with Clearout.

SignUp now

Get 100 FREE Credits

FAQs

Q1: Is Clearout GDPR-compliant?

Yes, Clearout doesn’t store or misuse any personal data. It adheres to GDPR and other global data protection laws.

Q2: Will Clearout slow down my forms?

No Clearout won’t slow down form speed or loading time. The validation happens in real time with minimal delay (milliseconds).

Q3: Can I apply Clearout to old forms too?

Yes, any embedded HubSpot form can be retrofitted with Clearout without rebuilding it.

Q4: What about mobile users?

Clearout works seamlessly across mobile and desktop browsers.

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