HubSpot Phone & Email Validation Integration
Validate phone numbers and verify emails automatically as contacts enter HubSpot, so your sales and marketing teams work from clean, scored data.
The 1Lookup HubSpot integration validates phone numbers and verifies email addresses directly inside your HubSpot workflows. When a contact is created or updated, 1Lookup checks the number's line type and carrier and the email's deliverability, then writes the result back to custom properties, so your CRM stays clean without manual checks.
Why validate HubSpot contacts with 1Lookup
HubSpot is only as effective as the contact data inside it. Invalid phone numbers waste sales reps' time, undeliverable emails hurt your sender reputation, and disposable or VoIP numbers slip fraud and junk leads into your pipeline. 1Lookup adds a real validation step so every contact is checked against live carrier and email-deliverability data before your team acts on it.
Because 1Lookup runs through HubSpot's native workflow actions, there is no code to maintain. You map the phone or email property to a 1Lookup lookup, store the verdict and supporting fields (line type, carrier, deliverability) in custom properties, and branch your automation on the result, for example, routing valid mobile numbers to SMS outreach and flagging undeliverable emails for review.
What you can do
Automated validation on contact create/update
Trigger a 1Lookup check whenever a contact's phone or email changes, so data is verified at the point of entry instead of in a periodic clean-up.
Write results to custom properties
Store line type, carrier, deliverability, and a validity verdict on the contact record so reps and reports can see data quality at a glance.
Lead scoring and routing
Use validation results in HubSpot scoring and workflow branches, prioritise reachable mobile numbers, suppress role-based or disposable emails.
Bulk clean existing lists
Run 1Lookup batch validation on an exported HubSpot list, then re-import the results to clean contacts you already have.
How to connect 1Lookup to HubSpot
Create a 1Lookup account and API key
Sign up for a free 1Lookup account and generate an API key from the dashboard. The free tier includes lookups you can use to test the integration.
Add validation custom properties in HubSpot
In HubSpot, create contact properties to hold the results, for example 'Phone validity', 'Line type', 'Carrier', and 'Email deliverability'.
Add a webhook/custom action to a workflow
In a contact-based HubSpot workflow, add a webhook action (or an Operations Hub custom-coded action) that calls the 1Lookup API with the contact's phone or email.
Map the response and branch your automation
Write the 1Lookup response fields back to your custom properties, then add if/then branches so valid and invalid contacts follow the right path.
Use cases
Cleaner inbound leads
Validate form-fill phone numbers and emails the moment they hit HubSpot, so reps never chase a fake or undeliverable contact.
Better SMS and email deliverability
Route only valid mobile lines to SMS sequences and suppress undeliverable emails to protect your sender reputation.
Frequently asked questions
Do I need to write code to use 1Lookup with HubSpot?
No. The integration uses HubSpot's native workflow webhook actions, so most teams can set it up without code. Operations Hub's custom-coded actions are an option if you want more control over the request and response mapping.
What data does 1Lookup return for a HubSpot contact?
For phone numbers, 1Lookup returns validity, line type (mobile/landline/VoIP), and carrier. For emails, it returns deliverability and detects disposable and role-based addresses. You choose which fields to store as HubSpot properties.
Can I validate contacts I already have in HubSpot?
Yes. Export the list, run it through 1Lookup batch validation, and re-import the results to clean your existing database in addition to validating new contacts in real time.