How to Block Form Submissions from Specific Email Domains in Hubspot

Managing form submissions effectively in Hubspot is essential for keeping your CRM clean, reducing spam, and protecting the quality of your lead data. By blocking specific email domains from submitting your forms, you can automatically filter out unwanted contacts before they ever reach your database.

This step-by-step guide explains exactly how to configure blocked email domains on individual forms so you can control who is allowed to submit information through your Hubspot forms.

When to Block Email Domains in Hubspot Forms

Before you update any settings, it helps to understand the main reasons you might want to block email domains in Hubspot:

• Repeated spam submissions from the same email domain
• Test or internal domains you do not want in your reporting
• Known low-quality lead sources you want to exclude
• Compliance requirements that restrict certain domains

Blocking domains at the form level gives you precise control over which contacts can submit particular forms in Hubspot, without affecting other forms or tools in your account.

Prerequisites for Using Blocked Domains in Hubspot

To follow the steps below, you will need:

• An active Hubspot account with permission to edit forms
• At least one existing form, or the ability to create a new one
• A list of email domains you want to block, such as example.com or mailinator.com

The ability to block domains is configured per form, so you can apply different rules to different Hubspot forms depending on your needs.

Step-by-Step: Block Email Domains in a Hubspot Form

The following steps outline how to open your form and configure domain blocking directly in the Hubspot form editor.

Step 1: Navigate to the Forms Tool in Hubspot

1. Log in to your Hubspot account.
2. In the main navigation, go to Marketing > Lead Capture > Forms.
3. You will see a list of all existing Hubspot forms in your account.

If you have not created a form yet, you can create one from this screen, then return to these instructions to configure the blocked domains.

Step 2: Open the Target Form in the Hubspot Editor

1. From the forms list, locate the form you want to protect from specific email domains.
2. Click the name of the form to open it in the Hubspot form editor.

All settings related to blocked email domains are configured within the editor interface for each individual form.

Step 3: Access Form Options in Hubspot

1. Inside the form editor, look for the Options tab or section in the left sidebar or top navigation, depending on your Hubspot interface.
2. Click Options to reveal additional configuration settings for this form.

The blocked email domains setting is part of the broader options area, along with other submission and follow-up preferences in Hubspot.

Step 4: Add Blocked Email Domains

Within the options area of your Hubspot form, locate the setting related to blocking email domains. The exact label may vary slightly, but it typically references blocked email domains or similar wording.

1. In the Blocked email domains field, enter each domain you want to block.
2. Use the format domain.com without the @ symbol.
3. Separate multiple domains with commas or line breaks, according to the instructions shown in your Hubspot interface.

When a visitor attempts to submit the form with an email address that matches one of these domains, Hubspot will prevent the submission and display an error message instead of creating a contact.

How Blocked Email Domains Work in Hubspot

Understanding how the blocking logic operates in Hubspot will help you choose the right domains and avoid accidentally excluding good leads.

Matching Rules for Blocked Domains

• Hubspot checks the domain portion of the email address (the text after the @ symbol).
• If that domain exactly matches one of the blocked entries, the form submission is rejected.
• Subdomains may require you to add each version you want to block (for example, mail.example.com and example.com), depending on your use case.

This behavior ensures that only email addresses from the specific domains you list are blocked, allowing legitimate contacts from other providers to submit Hubspot forms normally.

Visitor Experience When a Domain Is Blocked

When someone enters an email address with a blocked domain and tries to submit your Hubspot form, they will see a validation message. The submission will not be processed, and no contact record will be created.

You can customize other aspects of the form experience, but the blocked domain behavior itself is handled automatically by Hubspot once you configure the relevant list of domains.

Best Practices for Managing Blocked Domains in Hubspot

To get the most value from this feature, use the following best practices when configuring and maintaining blocked email domains in your Hubspot forms.

Review Domains Regularly

• Schedule periodic reviews of your blocked domain list.
• Remove domains that are no longer an issue.
• Add new domains if you notice fresh spam patterns in Hubspot.

Regular maintenance prevents accidental over-blocking and ensures you keep relevant data flowing into your Hubspot CRM.

Start with Disposable and Known Spam Domains

A common use case is to block disposable or temporary email providers. These addresses often lead to poor engagement and clutter your Hubspot reporting.

• Identify throwaway email services showing up in your submissions.
• Add those domains to your blocked list for key forms that should only collect serious leads.

This approach maintains data quality while still allowing general inquiries through other, less critical forms in Hubspot.

Use Different Rules for Different Hubspot Forms

Because blocked domains are configured per form, you can tailor the rules for each Hubspot asset:

• Tightly restricted domains for high-intent sales or demo forms.
• More permissive rules for newsletter signups or content downloads.
• Internal-only forms that block all external domains if required.

This flexibility lets you use Hubspot as both a marketing and governance tool without compromising your lead generation strategy.

Troubleshooting Blocked Domain Settings in Hubspot

If you run into issues with domain blocking, use these checks to diagnose and resolve the problem in Hubspot.

Submissions Are Not Being Blocked

• Confirm the domain is entered correctly (no @ symbol, no extra spaces).
• Test with an address that exactly matches the blocked domain.
• Make sure you are editing the correct Hubspot form and that it is published.

If the form is embedded on an external page, republish or refresh the embed code if changes do not appear to take effect immediately.

Legitimate Leads Are Being Blocked

• Check the list of blocked domains for overly broad entries.
• Remove or refine domains that could apply to valid customers.
• Test multiple email addresses from different providers to confirm behavior.

Adjusting the list carefully in each Hubspot form ensures that only truly unwanted domains are restricted.

Additional Resources for Hubspot Form Management

For full technical details straight from the platform, review the official documentation on blocking form submissions from specific email domains on the Hubspot Knowledge Base: Hubspot form domain blocking guide.

If you need broader strategy support around lead management, CRM hygiene, and marketing automation beyond the basic Hubspot configuration, you can explore expert consulting resources such as Consultevo for guidance.

By correctly setting up blocked email domains on your forms and following these best practices, you can keep your Hubspot database clean, reduce spam, and ensure that your marketing and sales teams are working with accurate, reliable contact information.

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