5 Powerful Email Validation APIs

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Email is one of the most important ways to communicate electronically. It is how we stay in touch with family, friends, colleagues, and customers. However, email is also one of the most commonly abused communication channels. It is estimated that over 50% of all emails are spam, which is only increasing.

Email providers have become increasingly strict in filtering incoming emails to combat spam and other abuse. As a result, legitimate email messages are often caught in the spam filter trap. This can be frustrating and cause communication breakdowns.

One way to combat this problem is to use an email validation API. An email validation API can help ensure that your message will be delivered by checking the email address against a database of known valid email addresses.

There are many email validation APIs out there, but not all are created equal. To help you choose the right one for your needs, we’ve compiled a list of some powerful email validation APIs on the market.


EmailHippo is an email validation service that helps businesses to verify the accuracy of their email lists. The service is designed to improve the deliverability of email marketing campaigns by ensuring that the addresses on the list are valid. EmailHippo uses various methods to validate email addresses, including checking the syntax of the address, checking the domain for a valid MX record, and checking the address against a database of over 200 million email addresses, and can even check for typos and common misspellings.


  • Support many integrations such as Salesforce, Microsoft Dynamics, WordPress, Hubspot, Formstach, unbound, Zapier, Auth0, and many more.
  • It is a simple, fast, and effective way to ensure that your email list is clean and up-to-date.
    *Great tool for email marketing. It allows you to easily create and manage your email list and track your results. It also provides a wide range of features, including autoresponders, email templates, and more.


  • The free email checker tool is not as comprehensive as the paid service, so you may not get the complete picture of your email deliverability.
  • EmailHippo can be slow to respond to customer queries, so you may not promptly get the help you need.
  • Pricing is not that transparent, so it might be challenging to estimate how much you’ll be paying for the service.


ZeroBounce is an email verification service that helps businesses improve their email deliverability and protect their sender reputation. The service uses proprietary technology to verify email addresses in real-time, ensuring that only valid addresses with an accuracy of 98% are added to your mailing list. This helps to improve your email deliverability rates and avoid the potential damage to your sender’s reputation that can occur when using invalid or outdated email addresses.


  • Accurate, fast and secure email validation service.
  • Reach features like validate, score, test, and monitor.
  • Pricing for the paid service is fully transparent, so you can pay for exactly what you want.
  • Removes invalid email addresses and spam traps from email lists automatically.
  • Helps avoid getting blacklisted by ISPs.


  • ZeroBounce can be a bit expensive, and there is a risk that you could lose some good addresses if they happen to be on the same domain as a bad one.
  • Some valid email addresses may be flagged as invalid by ZeroBounce’s algorithm.
  • ZeroBounce only checks email addresses against a known list of invalid addresses, so it will not catch addresses that are not on that list but are still invalid.


Xverify is a powerful online tool that helps businesses verify customer identities and prevent fraud. It provides instant access to over 20 billion public records and allows businesses to customize their verification process to fit their specific needs. With Xverify, companies can quickly and easily verify customer identities to ensure they are who they say they are. This helps businesses avoid costly fraud and protects their customers’ identities.


  • Instantly knowing which email accounts are not safe to send to help you filter out potential problems when you send.
  • Xverify has a great drag-and-drop uploader to make the process quick, or you can also access the FTP.


  • Xverify is US-based, so if you are trying to verify international data, you may encounter some difficulties.
  • There is no option to remove duplicate email addresses.
  • Xverify is not 100% accurate, so you may still get some bad data even after using their verification tools.


Kickbox is another great email validation API that offers instant validation. It also checks the email address against a database of over 200 million email addresses. In addition, Kickbox offers a “risky” email check which can help to identify email addresses that are likely to be spam traps.


  • Kickbox is Fully compliant with GDPR (General Data Protection Regulation).
  • You can measure signals like bounce rates, user complaints, spam trap hits, user engagement, and many more features.
  • Unknown Verification Results are free.


  • More expensive compared to the others.
  • Doesn’t yet support integration with all the popular marketing apps.


NeverBounce is an email validation service that helps businesses avoid bounced emails that can plague any email campaign. By verifying email addresses before they are used, NeverBounce ensures that companies only ever send emails to valid, active addresses. This protects businesses from the wasted time and resources associated with bounced emails and helps improve deliverability and ensure their messages reach their intended recipients.


  • Supports integrations with more than 80 apps.
  • Cleans your email lists on a near-daily basis to ensure accurate data.
  • You can sync and automate your process by connecting to your email provider.
  • Has excellent API documentation.


  • NeverBounce can sometimes have difficulty verifying certain email addresses, so you may still need to manually check your list.
  • It can take some time to clean up your email list. If you have a large email list, it can take several hours.
  • It is a paid service, so a monthly fee is associated with it.

Honorable Mentions

Final Words

We hope you enjoyed our blog about powerful email validation APIs. In this post, we discussed some of the many email validation APIs on the market available to developers and businesses. If you found this article helpful, we encourage you to explore our comparison of APIs for sending emails, as well as our how-to on verifying emails using Redis and Twilio.