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Verify your HubSpot contacts

A clean contact database sends better and reports more honestly. Export your contacts to CSV, run them through MailSure, and update the records that cannot receive mail.

Verify a list free →

How it works

  1. 1

    Export the contacts

    Export the contacts or list you want to check from HubSpot as a CSV, including the email column.

  2. 2

    Verify the file

    Upload the CSV to MailSure. Every row comes back with a status, score and reason.

  3. 3

    Filter and act

    Download the invalid addresses and mark or remove those contacts in HubSpot. Keep the valid ones, and review risky addresses before a large send.

Why use MailSure for this

Protect your sending reputation

Bounces from stale contacts count against your sending domain. Clearing them out first keeps campaign results trustworthy.

Better lead data

Typo suggestions (gmial.com to gmail.com) let you recover real leads that would otherwise be lost.

Check new leads continuously

Developers can call the API from a form or workflow to verify addresses as they arrive.

See how the price compares in the pricing comparison, or try the free email checker first.

Frequently asked questions

Is there a native HubSpot integration?
Not today. The CSV workflow works with any HubSpot plan, and the API can be called from your own forms or code.
How often should I clean my contacts?
Before any large campaign, and regularly (many teams do it quarterly), because lists decay as people change jobs and abandon inboxes.
Will verifying contact me or the contacts?
No email is ever sent to the addresses. Checks use public DNS and, where the receiving server allows it, a mailbox lookup.

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