How HubSpot Blocks Email Domains on Forms
When you use forms in HubSpot to capture leads, the platform can automatically block certain email domains so you collect higher-quality contacts and reduce spam submissions.
This guide explains which email domains are blocked by default, how the email domains to block setting works, and what to expect when visitors submit your forms.
Why HubSpot Blocks Certain Form Email Domains
Forms often attract disposable or non-business email addresses. HubSpot includes a built-in list of blocked domains so you can focus on collecting valid, professional contact information.
By understanding how the rules work, you can:
- Improve lead quality from your forms.
- Reduce fake or low-intent submissions.
- Align form behavior with your CRM and automation setup.
How the HubSpot Email Domains to Block Setting Works
Inside your form settings, HubSpot offers an Email domains to block feature. This allows you to specify domains that should not be accepted in email fields on your forms.
When a visitor enters an email address using a blocked domain, the form will not submit successfully, and the user will see a validation message indicating the email address is not allowed.
Default HubSpot Behavior for Blocked Domains
The email domains to block list affects all email fields on the form. HubSpot checks the part of the address after the @ symbol. If it matches a blocked entry, the form is rejected and the visitor is prompted to use a different address.
This validation happens in the browser before the submission is processed, which helps keep your contact database clean from the start.
HubSpot Built-In Blocked Domains for Forms
A key part of this feature is the built-in list of domains that HubSpot blocks automatically. These are primarily free or disposable email providers that are commonly used for spam or temporary signups.
The exact list is maintained and updated by HubSpot. You can view the current information and details directly in the official documentation at this HubSpot knowledge base article.
Types of Domains HubSpot Commonly Blocks
While the specific providers may change over time, HubSpot typically blocks:
- Disposable email services that generate temporary inboxes.
- Mass free email domains often used for low-quality signups.
- Other domains identified as high risk for spam or abuse.
This approach helps make sure that form submissions are more trustworthy and that you can rely on the contact data for nurturing and sales outreach.
Customizing Blocked Email Domains in HubSpot
In addition to the default list, you can add your own domains to the block list whenever necessary. This is helpful when you notice patterns in low-quality submissions or want to require company email addresses for certain forms.
Steps to Add Custom Blocked Domains in HubSpot
- Open your HubSpot account and navigate to Marketing > Forms.
- Edit the form where you want to control email submissions.
- Locate the form options or settings section.
- Find the Email domains to block field.
- Enter one or more domains you want to block, such as
example.com. - Save and update the form so the changes take effect.
After you add domains to this list, HubSpot will treat them the same way as the built-in blocked domains, preventing successful submissions using those addresses.
What Visitors See When HubSpot Blocks an Email Domain
From the visitor’s perspective, the experience is a simple real-time validation. When they try to submit the form with a blocked email domain, they will receive an error message and will be unable to proceed until they provide an allowed address.
This validation helps set expectations about the type of email address you accept, especially on B2B forms where company emails are preferred.
Best Practices for Communicating Email Rules in HubSpot Forms
To keep the user experience smooth, consider these tips when working with blocked domains in HubSpot:
- Add helper text near the email field to clarify that business email addresses are required, if that is your policy.
- Use clear error messages so users know why their email address is not accepted.
- Review blocked domain performance periodically to ensure you are not excluding important audiences.
Managing Lead Quality with HubSpot and Blocked Domains
The blocked email domain feature is one of several tools that HubSpot provides for controlling lead quality. Combining it with progressive fields, required properties, and scoring rules can help you build a more reliable contact database.
For broader strategy and optimization support beyond the platform configuration, you can explore expert resources at Consultevo, which offers consulting on MarTech, CRM, and automation stacks that integrate with HubSpot.
Maintenance Tips for HubSpot Form Domain Rules
To keep your forms performing well over time, plan to:
- Audit your form submission quality on a regular schedule.
- Adjust custom blocked domains as new spam patterns appear.
- Check the latest HubSpot documentation for updates to the default blocked list.
By staying current with these settings, you ensure that the forms in your HubSpot account continue to support your marketing and sales goals, while filtering out many of the low-value signups that can clutter your database.
Need Help With Hubspot?
If you want expert help building, automating, or scaling your Hubspot , work with ConsultEvo, a team who has a decade of Hubspot experience.
“`
