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The Anatomy of a Great Email Checker API

The Anatomy of a Great Email Checker API

Verifying email IDs is critical to the success of your marketing campaign. Without validation, you cannot separate genuine clients from fake customers, and as a result, you can’t reach genuine buyers. By using a great email checker API, you can effectively verify the email addresses in your database. There are plenty of validation APIs available on the market. But what are the properties of a valid email checker? How can one make your life easier? In this post, you will find all the details.

Challenges Businesses Often Face with Invalid Customer Emails

a person looking at business emails on laptop

Businesses face a number of challenges when dealing with invalid customer emails. Take a look at the most significant ones:

  • Missed Communication Opportunities:  When a customer provides an invalid email, messages sent to them are essentially lost. It leads businesses to miss valuable chances of engagement with customers.
  • Poor Customer Experience: Customers who don’t receive emails miss important information about their orders, updates on products or services, or promotional offers. It creates frustration among the customers, leading to a negative perception of the business.
  • Decreased Customer Engagement: Invalid emails prevent businesses from effectively keeping customers informed and involved. This reduces overall customer engagement and hinders the businesses’ growth.
  • Wasted Resources: Businesses spend time and money maintaining email lists. Removing invalid emails from the list diverts resources from other important tasks and impacts overall efficiency.
  • Difficulties in Customer Retention: Customers who don’t receive updates feel disconnected from the brand. So, it becomes difficult for businesses to retain a loyal customer base and build strong customer relationships.

By implementing email verification strategies, businesses can mitigate these challenges and ensure their email marketing efforts are effective, efficient, and compliant.

What is an email checker API?

An email checker is a tool for efficiently verifying the email addresses in your database. These tools check if the email is valid, accurate, and deliverable. They use a variety of advanced techniques to identify inaccurate and fake email addresses. These include syntax checks, disposable email checks, and SMTP verification to eliminate fake contacts. As a result, you can reach real customers, land big deals, and grow your business.

What are the properties of a great email checker API?

  • Support for Advanced Technologies: A great valid email checker API supports a variety of advanced technologies, like syntax check, disposable email check, and SMTP verification. Using one can identify and eliminate fake email addresses from your database.
  • 256-Bit Encryption: 256-bit encryption is the industry-standard technology for securing data streams. It protects your database from hackers during the validation process. This means you don’t have to worry about potential security threats.
  • Comprehensive Documentation: A great free email checker API comes with comprehensive documentation. It explains everything in detail and is very easy to follow. You won’t have any problem understanding or implementing the key features of the API. Besides, it provides code examples in a variety of programming languages. Using them, you can implement the API into your application in just a few minutes.

Factors to Consider When Choosing the Right Email Checker API

Selecting the most suitable API requires careful consideration of various factors for optimal performance and return on investment. Take a look at some of them:

  • Accuracy and Deliverability Rates: Look for an API with a proven track record of delivering highly accurate results. The API should provide valuable insights into identifying valid and deliverable email addresses.
  • Functionality and Features:  Identify APIs that can detect catch-all email addresses and handle bulk verification efficiently. Check out the key features before choosing an API.
  • Integration and Development Support: Evaluate the API’s documentation and the quality and responsiveness of the API provider’s technical support.  
  • Pricing and Cost-Effectiveness: Analyze the API’s pricing structure and plan options. Consider factors like your email verification volume and budget for the most cost-effective solution. Moreover, choose the option that best aligns with your specific needs.

By evaluating these factors, you can make an informed decision and select the free email checker API that best meets your specific requirements.

What is the best email checker API?

Mailboxlayer is one of the best email checker APIs. It is a powerful tool for validating email IDs on your database effectively. Mailboxlayer supports advanced features, including syntax and typo check, free and disposable provider filtration, and SMTP verification. It also offers 256-bit HTTPS encryption. As a result, mailboxlayer can efficiently verify email addresses while maintaining a high level of security.

What Features Mailboxlayer API Offers?

homepage of mailboxlayer free email checker api for email validation and email verification

Mailboxlayer offers a feature-rich API for email verification. Here are some of the key features of Mailboxlayer API:

  • Syntax & Typos Validation Checks: Mailboxlayer implements syntax validation, typo checks, and more to ensure the correctness of email addresses.
  • Real-Time SMTP: Email addresses are checked to see if the server accepts emails sent to any address at a specific domain, known as a catch-all configuration. 
  • Role Check: Mailboxlayer filters “role” email addresses associated with a function or position rather than a specific individual. 
  • Email Provider Database: Mailboxlayer regularly updates the database to separate free and disposable emails from real domains.
  • Extended Usage Statistics: Mailboxlayer offers insights into daily or monthly API usage by sending automatic notifications.
  • World-Class Tech Support: Mailboxlayer provides technical support, helping users give information when encountering service issues. 

Understanding these Mailboxlayer API features lets you determine if they align with your specific email verification requirements.

What Makes Mailboxlayer the best email checker API?

  • Very easy to implement into your web applications
  • Robust and interactive documentation
  • Provides advanced security features, including the industry-standard 256-bit HTTPS encryption
  • Offers advanced validation technologies, including catch-all detection and disposable email checks, for complete verification
  • Lightweight and super-fast

How can Mailboxlayer make my life easier?

Mailboxlayer makes your life easier by allowing you to effortlessly integrate the API into your web application. The whole process takes less than 10 minutes. You just need to write a few lines of code. It also provides comprehensive, intuitive documentation that explains everything. It’s hassle free.

How can I implement Mailboxlayer into JavaScript web applications?

1. First, you need to set the API access key. You can get it for free by simply signing up here. You also need to specify the email address that you want to validate.

2. Next, you have to make an AJAX call to verify the email address.

Overall, the code will look like this:

a happy developer using email checker API

How can I implement Mailboxlayer into PHP web applications?

1. Set the API access key and specify the email ID that you want to verify.

2. Now, you have to initialize cURL by using this code:

3. Then you have to store the data and close the cURL session.

4. Next, you have to decode the JSON response.

5. Finally, you access the validation result objects by using this code:

Overall, the code will look like this:

That’s it! You have successfully integrated Mailboxlayer into your JavaScript and PHP web apps. It just takes a few lines of code. It doesn’t require you to do anything from scratch — everything is built into the API. 

What information does Mailboxlayer provide after the validation?

Mailboxlayer provides a wide range of data in lightweight JSON format, like format validity, user role,  and SMTP check result. Let’s try making a request to the API’s base URL and analyzing the result:

You will get this response:

As you can see, the format_validmx_foundsmtp_check, and catch_all fields are set to true. That means the email ID is valid. The disposable and free fields are also set to false. This means the email ID is not from a disposable email address provider, like Mailinator, which spammers widely abuse. Finally, you see that the overall validation score is set to 0.8. The maximum value is 1. So, it’s a great score, and it indicates that the email ID is accurate, valid, and deliverable.

Bulk Email Address Check

Mailboxlayer also allows you to check multiple email addresses at the same time. You just need to separate each of the IDs with a comma. For example, you can perform the verification by simply appending multiple comma-separated email addresses to the API’s base URL.

Documentation: Is it easy to follow?

The documentation is straightforward. It explains all the functionality in detail, and you will not face any issues following it.

Another big plus is the Mailboxlayer’s API errors documentation. This section explains all the API error codes. The other email ID validation APIs, like Zerobounce, don’t have a similar section in their documentation. Mailboxlayer also provides in-depth explanations of all the validation tools, including role check, free provider check, and real-time validation. In addition, the documentation provides examples of using the API in different languages, including PHP and JavaScript. You can integrate Mailboxlayer into your web apps in just a few minutes by following them.

Overall, the documentation is comprehensive and intuitive. So, it can make your life a lot easier.

Pricing: How much does it cost?

Mailboxlayer comes in four different plans: Free, Basic, Professional Plus, and Enterprise Plus. The Free plan allows you to make 100 API requests per month. However, it provides limited technical support. If you want unlimited support, you need to go for the $14.99/month* Basic plan. It allows you to make 5,000 requests every month.

If you need more flexibility, you can choose the $74.99* Professional Plus plan, which offers 50,000 requests per month. If you need to make even more requests, you should pick up the $249.99* Enterprise Plus plan, which supports 250,000 API requests per month.

The good thing about Mailboxlayer is that it doesn’t follow the pay-as-you-go pricing model like ZeroBounce. That alone can save you a lot of money. For example, it costs only $74.99* to check 50,000 emails with Mailboxlayer. If you use ZeroBounce, you will spend $325* for the same volume. You can also check out  kickbox.com reviews comparisons to mailboxlayer.

 * Pricing data collected in April 2022.

Is Mailboxlayer the best email checker API on the market?

Mailboxlayer comes with all the tools required to effectively validate the email IDs on your database. It is very powerful and super-fast, and it takes just a few seconds to complete the verification. Mailboxlayer is also highly secure, and 256-bit HTTPS encryption protects your database from potential security threats. Besides, it is user-friendly and reasonably priced. As a result, Mailboxlayer is considered the best email address checker API available online. You can rely on it to efficiently eliminate inaccurate and fake contacts from your mailing list.

Mailboxlayer is the best email checker API on the market. It is fast, secure, and very easy to integrate into web applications. Try it now for free.

Harness Mailboxlayer API for Superior Email Validation Solutions!

Mailboxlayer API offers a comprehensive solution to validate email addresses in real time. It detects syntax errors, checks domains, and identifies disposable or temporary email addresses. 

The API also offers advanced features like catch-all domain detection, role-based email identification, and more. You can enhance the security and integrity of your data, streamline your operations, improve deliverability rates, and boost overall efficiency. 

You can search API marketplaces such as APILayer and get Mailboxlayer API for the ultimate email validation solution.


The success of any marketing campaign heavily relies on the accuracy and validity of customer email addresses. Invalid email addresses the risk of potential customers missing out on valuable opportunities. 

However, businesses can effectively verify email addresses in their database with the right email checker free version API, such as Mailboxlayer. Mailboxlayer API stands out as a powerful solution for email validation, offering advanced features like syntax and typo checks, role-based email detection, and real-time SMTP verification. 

The API ensures businesses reach real customers and avoid the pitfalls of fake or invalid contacts. It also drives growth, builds stronger relationships with the audience, and ultimately achieves greater success in their marketing efforts. 


Can a free email checker tool detect disposable or temporary email addresses?

Yes, a free email checker tool can detect disposable or temporary email addresses. It helps businesses filter out potentially harmful email addresses from their contact lists.

Does Email Checker APIs Help Reduce Email Bounce Rates?

Yes, Email Checker APIs reduce email bounce rates. The API identifies and removes invalid or non-existent email addresses from mailing lists before sending out campaigns. 

Is the Mailboxlayer API easy to integrate with other systems or platforms?

Yes, the Mailboxlayer API is easy to integrate with the other systems or platforms. The API offers simple techniques for seamless integration with CRM systems, e-commerce platforms, and other third-party applications.

How frequently is the data used by the Mailboxlayer API updated?

The Mailboxlayer API uses regularly updated data sources to ensure accurate email verification results. The frequency of updates depends on the data provider and the availability of new information.

Can I track usage and monitor API performance with the Mailboxlayer API? 

Yes, the Mailboxlayer API provides usage statistics and performance monitoring tools. It allows users to track API usage, monitor response times, and analyze performance metrics. This helps businesses optimize their usage and identify areas for improvement.

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