Email Address Validation API

Improve deliverability by validating email addresses before you send.

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Better delivery rates

More messages delivered to real contacts.

Use our real-time API to detect and suppress invalid email addresses. With a clean list, you reduce your bounce rate and perform better with mailbox providers to improve delivery.

  • Real-time Email Address Validation API

  • Machine Learning and mailbox provider-friendly tactics

  • Ability to identify mistyped, inactive, non-existent, disposable, or shared (team@, help@)

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Minimize funnel leaks

Don’t lose leads to typos.

Connect the real-time API to lead capture forms to catch false entries right away. Prompt visitors to resubmit with the provided correction suggestion—no need for additional confirmation fields.

  • Guarantee recipients get the emails they want from you

  • Avoid losing contacts due to accidental email address typos

  • Remove additional fields like email address confirmation

Safe senders only

Stay in the ‘good sender’ category.

Our API doesn’t use the broken SMTP-handshake, which attempts to validate an email address by connecting to mailbox providers until receiving a response and then breaking the connection.

  • Avoid Spammer-affiliated tactics used by other vendors

  • Do not use the broken SMTP-handshake

  • Maintain mailbox provider trust

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Learning at scale

Learning at scale

Smart and safe—almost like hiring a 🤖.

Put our massive dataset to work with a machine learning model that informs email address validity scoring. You can trust that we’re always working to improve your deliverability.

  • Use ML model trained with data from 100 billion emails/mo

  • Built and maintained by in-house Data Scientists

  • Protect recipients’ personal data with GDPR compliance

How much will it cost?

Available for Pro and Premier plans.
Pay per validation after you exceed your plan’s limit. Or request a quote with the button below.




Build something better

Dynamic Templates

Email templates with HTML rendering and conditional formatting with testing previews—accessed by your API calls.

SMTP Service

Send over our leading cloud-based SMTP service for a quick and easy integration via SMTP relay or our flexible API.

Email Testing for Dynamic Templates

Test for inbox rendering, link validity, and performance against spam filters.

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Ready to start sending?

Free to get started. Free to send.