20 Things You Should Know About the Best Email API

A business can use an email verification API, also known as an email validation API, to detect inactive and invalid email accounts. It keeps track of deleting dangerous or inactive email accounts and stops businesses from sending emails to bogus addresses.

Furthermore, email validation aided in preventing basic user mistakes such as misspellings and mistyped entries. As a result, businesses must manage their emails since more and more emails are sent to clients regularly from various firms.

Mailboxlayer is the best email validation and verification JSON API for Developers that measure email deliverability and quality while keeping things simple for the user.

Being the best email API, it thoroughly checks and verifies email addresses right at the point of entry into your system and does much more.

This article will discuss 20 things that are essential to know when starting your journey with mailboxlayer.

How Does Mailboxlayer Provide Its Customers With Full Verification

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How to Get API Access Key And Authenticate it

After registering, each user is given a personal API Access Key, which serves as a one-of-a-kind “password” for accessing the API’s data and capabilities. Simply append your access key to the primary endpoint URL to authenticate with the mailboxlayer API.

How to Make an API Request

Making an email validation request to the Mailboxlayer API is relatively straightforward because all verification tools are returned by the same (and only) API endpoint. To begin checking email addresses, the most basic API call requires only one argument (email) and the access_key field.

Below are some optional parameters that you can add to your API request:

What API Response Should You Expect From Mailboxlayer

All validation data from the mailboxlayer is returned in the universal and lightweight JSON format. There are ten separate response objects in each API response whose details can be checked in the API documentation.

Does Mailboxlayer Have an Email Provider Database

Yes! Mailboxlayer has an extensive database of email providers. You can separate free and disposable emails from genuine domains using our constantly updated provider database.

Can You Use HTTPS to Encrypt Your API Requests

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Any customer using mailboxlayer API can access all data given and available through the API over a secure connection (industry-standard SSL).

Simply add an s to the HTTP Protocol to establish a secure connection, making it https://. Thus, users can ensure secure and encrypted datastreams by connecting to the API via industry-standard HTTPS.

Does Mailboxlayer Have Documentation

Being the best email API, mailboxlayer provides its customers with detailed documentation. A customer can go through this to understand every aspect of this fantastic API, ranging from access specifications to API validation tools.

You’ll be able to check out the API’s features as you go through their documentation once you’ve joined up.

Do Users Have Access to Their Usage Statistics

Track your API consumption daily or monthly and get automated alerts when you’re running short. Requests to the API are rate limited based on your current subscription plan, and if your rate limit for a given minute has been crossed, the API will return an error carrying the type rate_limit_reached.

What Makes Mailboxlayer a Simple And Secure API

How Does Mailboxlayer Provide Syntax Check on API Requests

When an email address is requested to be verified, the mailboxlayer API will first do a regular email syntax check, ensuring that it complies with regular expression criteria (for further details, visit the API’s documentation).

The format_valid JSON object in the API response will return true or false depending on whether the email’s syntax is deemed to be valid.

Does the API Also Provide Typo Checks and Suggestions to the Users

Suppose the mailboxlayer API detects a probable misspelling or mistake in the domain component of the requested email address. In that case, it will offer an alternate email suggestion in the did you mean object of the API return set.

However, it’s crucial to note that the email address in the did_you_mean object is only a recommendation and has no bearing on other API response objects.

How Does Mailboxlayer Do Email Verification in Real-Time

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The mailboxlayer API checks email addresses by looking for MX-Records and utilizing SMTP, or Simple Mail Transfer Technology, which is the protocol that we all use to send and receive emails over the internet.

Our system starts the real-time email verification process by determining if the requested domain is set up to receive email. This is where the MX-Records check in the API comes in handy. The API’s mx _found response object will notify you if MX-Records for the provided domain are found.

The mail server for the given email address is then contacted via SMTP. The SMTP dialogue that follows is the most important aspect in determining whether or not the email address provided is valid. The smtp_check JSON object in the API response will return true or false based on whether or not an SMTP check was successful.

What Is the Best Email API’s Catch-All Detection Feature

The real-time verification procedure of the mailboxlayer API does not conclude with a single SMTP check. Instead, a catch-all detection mechanism has been created since many email servers are set to catch (accept) all incoming mail traffic, independent of the requested email address’s local portion.

This capability is disabled by default due to its significant influence on the API’s response time. However, by inserting the API’s catch_all parameter to the request URL and setting it to 1, you may enable catch-all detection.

How Can You Role Check an Email Address With This API

The technique of determining whether or not the requested email address is a role email address is another aspect of mailboxlayer email verification. A role email is an address that usually refers to a function (such as “support” or “postmaster”) rather than a specific person or name.

Because open rates are often poor, this sort of email address may be undesired when delivering email marketing. If the requested email is a role address, the role JSON object in the API response will return true or false.

Can You Check Which Email Provider an Email Corresponds to


The mailboxlayer API is connected to a regularly updated database of all accessible email providers, allowing it to detect free email services such as Gmail and Yahoo!

The free JSON object in the API response will return true or false depending on whether the requested email address is discovered to be utilizing a free service.

What is the Disposable Provider Check Feature of Mailboxlayer

If the requested email address is determined to utilize a disposable email provider, the API will also return a disposable JSON object containing true or false. More information on disposable email services may be found in the documentation.

Does Mailboxlayer Rate the Quality of Your Requested Email Address

The API will provide a numeric Quality Score ranging from 0 (Bad) to 1 (Good) to indicate the quality and deliverability of the given email address at the end of the mailboxlayer validation and verification procedure.

This Quality Score is created for each requested email address using a smarter algorithm that evaluates three primary factors: appearance, deliverability, and background.

What Error Codes Should You Expect When Your Query Fails, and What Do They Mean

If your query fails, the mailbox API will respond with a 3-digit error code, an internal type error, and a plain text “info” object containing suggestions for the user. To learn more about error codes and their meaning, you can visit the mailbox’s official documentation.

How do JSON Callbacks and JSON Formatting Features Make Mailboxlayer More Efficient

The mailbox API also supports JSON callbacks. Simply include the callback parameter to your API endpoint URL and assign it to a function name of your choice to leverage the JSONP capabilities:


JSON formatting is also supported by the mailbox API, which can be leveraged to enhance the readability of its features. To use this feature, simply attach format=1 to any request URL. However, it is essential to note that using format increases the API’s return file size and which may cause problems.

Does This API Provide Code Examples for Its Customers

Mailboxlayer has several intuitive and detailed code examples in PHP (cURL) and JavaScript (jQuery.ajax). So if you are just starting with mailboxlayer, these examples will prove useful in understanding how to write API queries and what kind of API responses to expect.

What Are Some Other Advantages of Using Mailboxlayer

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What Are Some Advanced Tools That Mailboxlayer Has

This API’s bulk email address check tool is a premium feature available only to Pro Plus and Enterprise Plus members. Users can use this functionality to request email checks for many email addresses at once.

Simply attach several comma-separated email addresses to the API’s base URL to process email addresses in bulk. The API response will have several objects, where each object is returned for every email address in the request.

Is This API Easy on Your Budget

The best email API provides premium features and is friendly to your wallet. It offers 4 plans where one is free. The Free Plan provides a volume of 250 monthly API requests.

If you or your application needs more than 250 API calls per month or more professional API features, you may subscribe to one of the premium Subscription Plans, which start at just USD 9.99 per month or a 20% savings if you pay annually.

As a result, mailboxlayer has become one of the most popular real-time API verification and validation solutions. It provides you with the most significant email API experience possible and offers a variety of options from which to choose depending on your current needs.

In addition, you can perform API calls quickly because of its unique features and simple API architecture.

You must be eager to try out all the features and options discussed above. So, click here to get started with the greatest email API.