
Customer.io Email Verification Integration
Your Customer.io journeys rely on valid, verified data. If you don’t have a valid email address for contact, your communications go nowhere, and automations fail.
Get the official ZeroBounce Customer.io integration for 99.6% accurate and reliable email verification. Get rid of invalid email addresses, weed out high-risk spam traps and mailboxes, and ensure your campaigns always reach your audience.
Create a free ZeroBounce account now to get started!
Why choose ZeroBounce for Customer.io email verification?
Connect your Customer.io account to ZeroBounce via your API key, and unlock a variety of features, including bulk list verification, automatic contact monitoring, email scoring, and more!
Verify your Customer.io lists in bulk
ZeroBounce syncs seamlessly with your Customer.io account and automatically detects all of your email lists. Select which lists you want to validate, click the button, and wait for your results!



Gain more insights into your Customer.io leads and customers
Unlock more tools to gain insights into which leads are high-quality, and which are inactive or high-risk dead-ends:

Activity Data
Provides interaction data to show which email addresses have opened, clicked, forwarded, or unsubscribed in the last 30-365+ days (Available with ZeroBounce ONE)
Email Scoring
Uses proprietary AI to score catch-all mailboxes on a 0-10 scale, with “1” being the least active, and “10” showing the most engagement (“0” is unknown).

Additional Customer.io integration features:
Free duplicate email removal
Contact sharing between other connected integrations
Custom results mapping for your Customer.io database
Complete automation history
How to use the Customer.io integration
To use the integration, here’s what you’ll need:
- An active Customer.io account with appropriate contact list access
- A free ZeroBounce account
From there, you can set up your API connection using the following steps:
From your Customer.io account settings, go to API credentials, and create a new API key to use with ZeroBounce. Copy this key.

Go to Data & Integrations, and click Directory.

Find the Customer.io API, and copy the Pipelines API key. Copy the cURL command provided on the page, and enter it into your device’s terminal to create the connection.



Log in to ZeroBounce. In the integrations tab, select Customer.io, then enter your API keys in the menu.
That’s it! After securing your API connection, your Customer.io email lists will automatically sync with your ZeroBounce dashboard. From here, you can start validating and scoring any email lists.
Why validate your emails in Customer.io?
- Lower email bounce rates – By verifying every lead and customer email address, you ensure that only real people are added to your automations and journeys. Avoid high bounce rates and other deliverability issues.
- Better email deliverability – A high bounce rate can lower sender reputation, damaging deliverability. By validating your lists and each new Customer.io contact, you’ll avoid damaging your business reputation and consistently reach the inbox.
- Better analytics and campaign feedback – You spend hard-earned time creating communications for your customer journeys. Ensure your campaign performance details are accurate by sending only to real, valid mailboxes.
- Superior campaign performance – Validating, scoring, and gathering Activity Data for your contacts gives you the insight you need to improve engagement and conversions. Connect your Customer.io account, and start automatically validating contacts so that you can focus on your outreach efforts!
Get the ZeroBounce Customer.io integration now
Ready for superior email campaign results in Customer.io? Create a free ZeroBounce account today to get instant access to:
- The official Customer.io email verification integration
- Access to 60+ other integrations for CRMs, ESPs, website builders, and more!
- Free monthly benefits: including 100 credits, blacklist monitoring, and email testing tools
- Comprehensive integration and user documentation
- 24/7 support via live chat