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Mailboxlayer Vs Kickbox: Which Email Verification Service Is Best For?

Mailboxlayer Vs Kickbox

If you send a lot of cold emails, then you need a reliable email validator — the cost of sending too many bulk emails and having your account flagged as spam is simply too high for a business to risk. To help you avoid this issue, Email Validator APIs check and validate your outgoing email addresses to determine their authenticity. Using an email validator increases the chances of inbox placement, saves costs, and keeps your spam score low.

Two prominent email validation tools are Kickbox and Mailboxlayer. In this article, we review and compare both tools based on their features, pricing, performance, and ease of use to help you determine which of them is best for you. 

Mailboxlayer Overview 

Mailboxlayer is a simple JSON API that provides quick email address verification by checking syntax, typos, and spelling. It also validates emails through SMTP checks, disposable provider filtering, and other methods. This REST-based API also includes a wide range of security features like 256-bit HTTPS encryption, which helps secure email campaigns. 

Kickbox Overview 

Kickbox is an automated email verification tool that integrates with the major email service providers to verify email addresses. Kickbox groups email addresses on your contact list into deliverable, undeliverable, and potentially risky emails. The API can be used to verify email addresses in real-time, either at the point of collection or directly on your email list. 

General Features Table

  Mailboxlayer Kickbox
Pricing Paid subscription plans starting at $9.99 per month Pay as you go at $5 for every 500 email verifications
Exclusive features Email provider database Drag and drop email list verification
Security 256-bit HTTPS security None
Pros ·        Robust and interactive documentation
·        Advanced security features
·        Reporting and usage statistics
·        Flexible pricing
·        Accurate results
·        Drag and drop email list verification 
Cons None ·        No advanced features

Main Features 


  • Email List Verification: This allows you to quickly verify and validate addresses on your email list using simple drag and drop. This helps improve campaign accuracy by eliminating bounce. 
  • Bulk Email Verification: Kickbox can be integrated into different email marketing tools to verify email addresses in bulk 
  • Real-time Email Verification: The API can be integrated into apps for real-time email address verification. 

Score: 4/5


  • Validation & Verification: Mailboxlayer can be used to verify the existence, quality, and validity of email addresses.         
  • Email Provider Database: Users can identify and separate free disposable emails from real emails by checking against an email database that is updated daily.              
  • 256-bit HTTPS security: Datastreams connected to the Mailboxlayer API are secured and protected by industry-standard HTTPS encryption.             
  • Extended Usage Statistics: Daily or monthly reports to track the API usage. 

Score: 5/5

Verdict: Both tools are simple APIs with features for verifying and validating emails in different ways. However, Mailboxlayer offers more advanced features and is most robust security-wise.



Mailboxlayer offers a free trial version with no time limit. This gives you access to 250 API requests per month. To process higher API requests per month and access additional features like secure HTTPS encryption and technical support, you will need to sign up for a paid subscription plan. Plans begin at $9.99 per month, which grants you access to 5,000 API requests. 

Score: 5/5


Kickbox uses a pay-as-you-go plan with no monthly subscription payment required. New users get 100 free email verifications for a start. Subsequently, you pay $5 for every 500 email verifications with this too. The fee is not charged if the status of the email address is unknown. 

Score: 4/5

Verdict: If you only need email verification for a few emails, a limited period, or don’t want to be tied to a monthly plan, then Kickbox might be an ideal option. However, if you intend to handle a higher volume of email validation, then Mailboxlayer is more recommended. Kickbox is only cheap when you only need to send a few emails per month. For higher mail volumes, you will find Mailboxlayer a much cheaper alternative when you add up the cost. 

Ease of use 


Mailboxlayer is an easy-to-use API that can be integrated quite seamlessly. There is robust documentation to serve as a guide. The API can be called in any programming language, and it is pretty easy to set up. However, it would be best if you had a basic understanding of APIs to use this tool.  

Score: 4/5


The Kickbox Email Verification API is relatively easy to integrate into your email data collection processes. The API is fast, lightweight, and simple to use. You need just a few lines of code to integrate the API into your app. 

Score: 4/5

Verdict: Both APIs are easy to integrate. Mailboxlayer offers extensive documentation that guides users through integrating and using the API. However, Kickbox’s simple drag and drop email verification feature makes it quite simple to use. 

Which email verification service is best?

Both of these email verification tools are trusted by individuals and companies worldwide to verify the quality of email addresses and assess the deliverability of emails. They are robust API tools that can be easily integrated into applications either at the point of collecting emails or when sending out emails. 

Kickbox’s drag and drop email list verification tool makes it relatively easy to use for quickly verifying the authenticity of emails. However, Mailboxlayer seems to be more robust with a range of advanced features and security. Both are low-cost and reliable. However, Kickbox uses a pay-as-you-go pricing format which may only be cheaper for a very limited number of API calls. 

Generally, Mailboxlayer is more robust with a range of advanced functions and reliable security features which is why it is recommended for your business.

Sign up for Mailboxlayer API today to get simple but powerful email validation and verification service.

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