Inbox deliverability
solution for Enterprise

Reduce your bounce rates and improve your campaign’s performance with the most cost-effective email validation service.

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Rated 4.8/5 based on 400+ reviews

Trusted by 1,000's of forward-thinking teams in 170+ countries

Bulk email verifier online
Bulk email verifier & list cleaner

Improve your ROI by cleaning your email lists

Use our online bulk email verifier to increase inbox deliverability rate and improve campaign performance in no time.

  • Remove bounces and bad emails from your lists.
  • Improve your email deliverability to up to 99%.
  • Add email validation features to your own app using our APIs.
Javascript widget for Real-time email validation

Have only valid emails on your database

Add our real-time email checker to your current HTML forms by just copying and pasting one line of code. No custom development needed.

  • Block invalid emails before they get into your database.
  • Validate emails in real-time in your current HTML forms.
  • Install in seconds by just copying and pasting one line of code.
Email verification API

Tailor-made solutions made for Enterprise

Engineered for reliability

WIth a battle-tested algorithm and a cutting-edge global distributed servers network, our system counts on an average 99.9% SLA.

Private by design

Our storage servers are located in ISO 27001
certified data centers, and all your information transmitted
is protected by 256-bit TLS encryption.

Consierge-level support

TheChecker dedicated customer support team is ready to help you through any part of your email verification process.

Custom agreements

No business is identical, neither are we. From custom Data Management Agreements, payment conditions and pricing: we've got you covered.

Request your Enterprise Trial

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Don't take our word for it. Here's what our customers think.

SAP logo

"TheChecker has been the saving tool during my prospects! It helps me maintain excellent SMTP deliverability and find decision-maker emails when I have only his first and last name."

J. Figueiras

Rock Content logo

"I didn't know how many leads I missed due to bad invalid lists and sending reputation problems. TheChecker has made it very quick and easy to dramatically improve the quality of the campaigns and to generate new sales opportunities through email. I strongly recommend it!"

I. Castro

LeadLovers logo

"Here at LeadLovers, we are always looking for smart tools that help us to improve our email deliverability even more. By integrating TheChecker in the lead acquisition flow, we got amazing results in the prevention of sending reputation issues."

F. Milek

Evios logo

"The best! It's easy to use; the results are great. All works perfectly. We reduce all our marketing complaints and fake registers."

J. Perez