Top 5 Email Verification and Validation APIs for your Product

If you have spent some time running a website or online business, you would be aware of the importance of emails.

What many see as a decadent communication medium still holds immense value for digital marketers.

More than 330 billion emails are sent every day, even in 2022.

While email marketing is very effective, it is very difficult to do it right. One of the key reasons being the many problems that email marketers face with their email lists. Are the email IDs correct? Do they have spam traps? Are these disposable email addresses? There are a multitude of questions to deal with in email marketing and newsletter campaigns.

Email verification and validation APIs help us deal with this problem. APIs integrate with your platform and automatically check all email addresses for spam, mistyping, fake email ids, and so on. 

Top 5 email verification and validation APIs for your product

Today we will talk about the 5 best APIs that you can use to validate and verify the email addresses in your mailing list. Using an API can be a gamechanger for many email marketers. Before we get into the top 5 list, let’s discuss why APIs are so effective and how they work. 

Why APIs are so efficient

The major reason APIs work so efficiently is that it does not require human supervision. APIs work automatically and users do not have to manually configure them each time. The ease of use is one among many reasons you should start using an email verification and validation API.

If you maintain a mailing list, you would also want to know where your effort is going. All email marketers spend considerable time perfecting their emails. On top of that, they need to use an email marketing platform like Klaviyo. An API ensures that your hard work does not go in vain. By filtering out fake and disposable email IDs, you get a better idea of where your mailing stand stands. As a result, when you use a platform like Klaviyo along with an email verification API, the results are much better. In case you want something other than Klaviyo, you can learn more about Klaviyo alternatives here. 

How email verification and validation APIs work

Email verification and validation APIs work primarily in 7 ways:

  • Syntax Check
  • Address Name Detection
  • DEA (disposable email address) Detection
  • Spam Trap Detection
  • DNSBL and URI DNSBL Check
  • MX Record Lookup
  • Active Mailbox Check

With the help of these email verification and validation methods, you will see much better results from your email marketing campaign. On top of that, your business will not be identified as spam and will help in building reputation and authority.

Now that we have some idea about what email verification APIs are and what they do, let’s head over to the list. 

1. Abstract API

Abstract API is one of the most popular email verification and validation APIs out there. Here are some of its key features:

  • MX record check
  • GDPR and CCPA compliant
  • Does not store any email
  • Role email check

If you have looked for email address validation API on the internet, you must have come across Abstract API. It is among the best in the business and also comes with affordable subscription plans.

Abstract API helps with bounce rate detection, spam signups, differentiating between personal and business email IDs, and a lot more. However, the most significant feature of Abstract API is that it allows up to 500 free email checks every month. That’s a great way to see whether the product works for you before subscribing to it.

Abstract API is user-friendly and budget-friendly, which makes it a top choice for many email marketers. Anyone new to using these tools can easily learn about them from Abstract API. For these reasons, Abstract API has the number one spot on our list. 

2. SendGrid Validation API

After Abstract API, the second product to have top-notch features is SendGrid Validation API.  Here are its key features:

  • Uses machine learning to verify email addresses in real-time
  • Accurately identifies all inactive or inaccurate email addresses
  • You can check how your email appears in different mailboxes
  • Gives risk scores for all email addresses

While most email verification and validation APIs work similarly, SendGrid Validation API takes it a notch higher with machine learning and artificial intelligence. Despite having advanced features and functionalities, SendGrid Validation API is not difficult to use.

SendGrid Validation API operates on the cloud and does not store any of your email addresses. OIn top of that, there are easy settings and configuration options that users can tweak with. However, SendGrid Validation API does not have any free offering. There are only two plans: pro and premier. Users have to pay $89.95 per month to access SendGrid Validation API.

If you are looking for advanced email verification and validation API, no need to look beyond SendGrid Validation API. It has everything you would need for a solid email marketing campaign apart from having many additional features. 

3. Captain Verify

Another email verification and validation API – Captain Verify – is a one-stop solution for all email verification needs. Here are its key features:

  • Get reports on the overall quality of your email address database
  • Affordable plans
  • Compliant with GDPR regulations
  • Export encrypted CSV files

Unlike other email verification and validation APIs, Captain Verify does not stop after verifying the emails for spam, fake or invalid addresses, and so on. It helps email marketers understand how their campaign is performing and gives detailed reports on returns on investment. It is one of the best APIs available for the overall growth of your mailing campaign.

If you are looking for something simple yet powerful, Captain Verify will be a great option. Along with the features we mentioned already, it also lets users filter and refine their email lists. It can help you understand the overall quality of your mailing list much better.

As you can see, Captain Verify ticks most of the boxes to be one of the best email verification and validation APIs out there. Anyone looking for a good email API should give it a go. The best thing is that users get all this and more at only $7 per 1000 emails. 

4. Mailgun

Mailgun earns the fourth spot on our list. However, that does not mean it is any way less than the previous options discussed. Here’s what it offers:

  • RFC standards compliant
  • Daily and hourly tracking of API usage
  • Has a bulk list validation tools for faster operations
  • Supports both CSV and JSON format
  • Track bounce and unsubscribe rates

Email marketers around the world prefer Mailgun for all their email verification and validation needs. It has multiple features that allow users to check their mailing list for fakes and scams. Apart from that, it also gives users a good idea of how their marketing campaign is performing.

Mailgun enjoys high ratings across review platforms like Capterra and G2. People use it for a wide range of purposes, but email verification and validation remain the most important. Mailgun keeps track of bounce rates, hard bounce rates, and unsubscribe rates. With the help of these stats, email marketers can measure how their campaign is doing.

If you are looking for a simple email verification and validation tool, Mailgun can be a good choice. It is worth trying for anyone who wants to take their email marketing to the next level.

5. Hunter

Our last entry to the list is Hunter. It is a well-known API that is widely used by email marketers. Here’s what it gets right:

  • Compare your mailing list with the Hunter mailing list for comparative quality analysis
  • SMTP checks, domain information verification, and multi-layer validation
  • Easy integration with Google Sheets
  • Supports both CSV and .txt formats

Hunter gives what it calls confidence scores which represent how strong or weak your mailing list is. This email verification and validation tool follows all the checks that we mentioned earlier, including SMTP verification, gibberish detection, MX record checks, and more. These features have worked together to make Hunter one of the most popular email verification and validation tools.

Hunter email verification API integrates easily with any platform and has a user-friendly interface. It also has a free plan that lets users check up to 50 emails for free. Giving it a try without spending money is very useful for anyone looking for a new email verification and validation API.

If you are looking for an email finder and email verifier rolled into one, Hunter is the best solution. With so many features and functionalities, it is one of the favorite email verification and validation APIs for thousands of marketers and entrepreneurs.


When used correctly, email verification and validation APIs can give any online business a significant boost. As an email marketer, digital marketer, website owner, or entrepreneur, you should be using one of these APIs. If you aren’t using one already, find your top pick from our list of the 5 best email verification and validation APIs.

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