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HubSpot Email Verification Integration

Connect HubSpot with Mailthentic to clean contact lists, protect sender reputation, and improve campaign deliverability. One click to connect, no API keys to manage.

Connect HubSpot See how it works

CRM integrations are included with any paid plan, a subscription or purchased credits.

Why verify your HubSpot lists

A HubSpot database fills up fast from forms, imports, events and sales prospecting, and a large share of those addresses stop working within a year. When marketing email goes out to them, the bounces and spam complaints drag down your sender reputation and HubSpot itself restricts sending to contacts that repeatedly bounce. Bad addresses also distort everything downstream: lead scores, workflow enrolment, campaign reporting and the deal forecasts your team builds on top of them.

HubSpot is a CRM platform that brings marketing, sales and service teams onto one contact record, with email marketing, workflows, forms and reporting built in. Its contact database is the single source of truth for most of the teams that use it.

How HubSpot verification works

Three steps to a clean HubSpot list.

Connect HubSpot in one click

Authorise Mailthentic from your HubSpot account using secure OAuth. There are no API keys to manage, and you can revoke access from HubSpot at any time.

Import and verify your contacts

Choose the HubSpot list you want to clean. Mailthentic pulls the contacts in and runs the full verification stack on each address, returning deliverable, risky, catch-all and invalid results with confidence scores.

Push the results back to HubSpot

Write the verdicts back onto your HubSpot contact records so you can build lists, filter workflows and exclude bad addresses from marketing sends.

Benefits for HubSpot users

One-click OAuth connection

Connect HubSpot through secure OAuth. There are no API keys to generate, copy or rotate, and you can disconnect from either side at any time.

Protect your sending reputation

Bounces and complaints are what mailbox providers measure. Verifying HubSpot contacts before a marketing send keeps those numbers low and your emails in the inbox.

Avoid HubSpot bounce restrictions

HubSpot suppresses contacts that hard bounce and watches account-level deliverability. Cleaning your list first keeps your marketing email sending healthy.

Round-trip verification

Import a HubSpot list, verify it, and push the verdicts back onto the contact records. No CSV exports and no manual re-imports.

Trustworthy reporting

Open and click rates calculated against a list full of dead addresses are meaningless. Verified contacts give you numbers you can actually make decisions on.

Sales teams stop chasing ghosts

Reps waste sequences and follow-ups on addresses that never existed. Flagging invalid contacts puts that time back into real prospects.

What Mailthentic checks

Every HubSpot contact runs through the full verification stack.

Syntax validation

Catches malformed addresses and typos from form fills and manual CRM entry before they enter a marketing send.

Domain and MX record checks

Confirms the domain resolves and accepts mail. Contacts at companies that folded or rebranded bounce on every campaign.

Disposable email detection

Flags throwaway inboxes used to grab gated content. They inflate your HubSpot contact count and never convert.

Catch-all domain detection

Identifies domains that accept mail for any address, which is common at larger companies, and labels them honestly instead of guessing.

Role-based address flagging

Marks shared inboxes such as info@, admin@ and support@, which attract complaints and rarely belong in a nurture sequence.

Risky and invalid address detection

Full mailbox checks with confidence scoring separate genuinely deliverable contacts from the ones that will cost you reputation.

HubSpot use cases

Clean the database before a big marketing send

Verify the target list before a launch or newsletter so bounces do not spike and HubSpot does not start suppressing your contacts.

Scrub imported and event lists

Trade show scans, webinar registrations and partner lists are full of typos and burner addresses. Verify them before they merge into your CRM.

Qualify inbound leads before routing

Stop sending reps to work leads with unreachable email addresses. Verification tells you which inbound contacts are worth a sequence.

Periodic CRM hygiene

Run a verification pass on your contact database on a schedule so decay never builds up to the point where it hurts a campaign.

Frequently asked questions

How do I connect HubSpot to Mailthentic?

Connect in one click using secure OAuth. You authorise Mailthentic from inside HubSpot, and there are no API keys to create, paste or rotate. Access can be revoked from your HubSpot account whenever you want.

Does verification affect my HubSpot marketing contact count?

Verification itself does not add or remove HubSpot contacts, so your billable contact count is unchanged by the check. What it gives you is the information to remove or exclude dead addresses yourself, which is usually where the savings come from. Mailthentic never deletes contacts from HubSpot on its own.

Is the HubSpot integration free?

It is included with any paid Mailthentic plan, either an active subscription or purchased credits. It is not available on the free tier. New accounts get free credits for general email verification, but connecting a CRM requires a paid plan.

How does the round trip work?

Mailthentic imports contacts from the HubSpot list you choose, verifies each address, and then pushes the verification results back onto the contact records in HubSpot. From there you can build lists, filter workflows and exclude invalid addresses from marketing email.

Is my HubSpot data secure?

The connection uses OAuth, so Mailthentic never sees or stores your HubSpot password. Contacts are processed for verification only and are never sold or shared. Processing is GDPR aligned, with a data processing agreement and a published subprocessors page.

What happens to invalid contacts?

They stay in HubSpot, clearly labelled with their verification result, so you decide whether to suppress, segment or delete them. Nothing is removed from your CRM without you doing it. Most teams exclude them from marketing email and keep the record for sales context.

Can I verify new HubSpot contacts in real time?

Yes, through the Mailthentic API. Call it from your forms or backend before the contact is created, and block typos, disposable addresses and invalid mailboxes at the point of capture. That keeps the CRM clean continuously rather than in bulk cleanups.

Start cleaning your HubSpot lists today

New accounts get 1,000 free verification credits. CRM integrations are included with any paid plan.

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