Top 5 Most Popular Transactional Email Service Providers in 2021

List of Best Free Transactional Email API Service Providers with Detailed Review and Comparison:


The White Label Email API services are used to send transactional emails, newsletters, marketing emails, and promotional emails.

Examples of transactional emails are the emails we receive about social media updates, password resets, account creation, etc.

These transactional emails are generally sent through integration with SMTP (Simple Mail Transfer Protocol). It is a TCP / IP protocol that is used to send and receive emails.



What is the email API service?


It is a simple process to send and receive a single email.

But it becomes a difficult task when it comes to sending multiple emails. Therefore, the email API services help in this process. These services not only help to send and receive emails, but also to create them. It deals with the commitment factor.

These services allow you to keep track of the email sent and therefore take care of the deliverability factor as well. This means that it will increase the chances that your email will be delivered to the inbox and not as spam.

Most of the top transactional email services for developers that we are going to discuss in this article are cloud-based. So you can manage this email process through the app or the website and you won't have to manage the servers.

=> Contact us to suggest a list here.

What you are going to learn:

Top Transactional Email Service Providers in 2021

Below is the list of the most popular email API services for fast and reliable transactional email delivery .

Comparison of Top Email API Services

Email API Service ToolsUsed forPriceUsersSupported languages, frameworks and librariesSendinblue

📷Digital advertisingFree plan: 300 emails / paid and pricing starts at $ 25 / month.MarketersEasy integrations with C #, Go, Java, Node JS, PHP, Python, Ruby, Typescript-node.Mailjet

📷Transactional and marketing emails.Free plan with 6000 emails per month.
Basic plan: starts at $ 8. 69 per monthEquipmentPHP, Python, Ruby, Java, Node.js, ES2015, Go, C #.SendGrid

📷Email Newsletter,
Shipping Notifications,
Promotional Emails , and
Password Reset.Free plan,
Essentials - Starts at $ 9.95 / mo,
Pro - Starts at $ 79.95 / mo,
Premier - Custom.Developers, marketers.Client frameworks and libraries. PHP, Python, Ruby, Java, Node.js, Go, C #.Mailgun

📷Transactional and bulk emailFree: 10,000 emails and 100 validations per month.
The price will increase based on emails and validations.DevelopersRails, Python, PHP, Java, Microsoft.Net, Node.jsAmazon SES

📷Marketing, Notification. And transactional emailsPricing starts at $ 0.10.Companies and developersIntegration with other AWS services.Chuck

📷Data-driven emails, e-commerce, personalized one-to-one messages.1-20 blocks: $ 20 per block.
21-40 blocks: $ 18 per block.MailChimp usersPHP, Ruby, Python.

We are going to explore!!

# 1) Sendinblue

Pricing: Sendinblue has five plans including the Free plan, Lite ($ 25 per month), Essential ($ 39 per month), Premium ($ 66 per month), and Enterprise (get a quote). A free plan will allow you to send 300 emails per day.


Sendinblue provides a complete all-in-one digital marketing toolbox. Sendinblue provides the solution for email marketing, SMS marketing, and chat. It has functionalities for transactional email, segmentation, CRM, and marketing automation.

For greater participation, the tool will allow you to send marketing messages to a specific audience. Sendinblue will allow you to choose the configuration option from several options, such as API, SMTP, Relay, e-commerce plugins or marketing automation.


  • Sendinblue provides several professionally designed templates.
  • The tool has a drag-and-drop editor to help you design transactional email from scratch.
  • Email deliverability experts will work to help you get the email delivered to your inbox.
  • Provides participation and deliverability statistics.
  • It has features for landing pages, signup forms, Facebook ads, and retargeting.
  • Marketing automation features help you improve performance by automating marketing messages and segmentation.

=> Visit the Sendinblue website

# 2) Mailjet

Mailjet Pricing : Pricing depends on the number of emails you send per month. There is a free plan that allows you to send 6,000 emails per month. The basic plan starts at $ 8.69 per month for 30,000 emails. The price will increase accordingly as the number of emails increases.


The Mailjet email service provides many functions for creating, managing, sending and optimizing emails. The tool will allow you to customize the email templates. You will be able to work as a team on the email design.


  • Real-time collaboration.
  • Comments in the application.
  • Drag and drop editor to design the email.
  • Provides in-depth analysis of sent emails.

=> Visit the Mailjet website

# 3) SendGrid

Price: Free plan, Essentials (starts at $ 9.95 / month), Pro (starts at $ 79.95 / month) and Premier (custom).


It is a cloud-based email delivery service. Provides fast and customizable integration. It also offers a mobile app so you can share this unique email platform with your team. Expand support through video tutorials, online community, and documentation.


  • Supports development frameworks and client libraries.
  • Provides domain and link customization regardless of email sent from dedicated IP and shared IP pools.
  • Eliminate domain spoofing.
  • Delete phishing emails.
  • Provides security through two-factor authentication, API key permissions, IP access management, precise teammate permissions, and many more.

Website: SendGrid

# 4) Mailgun

Price: The price depends on the number of validations you require along with the number of emails sent per month. It's free for 10,000 emails and 100 validations per month. The price will increase considerably when the number of emails and validations increases.


This transactional service is made for developers. It is useful for sending, receiving and tracking emails. This service will be expanded according to your needs.


  • Provides advanced email analysis.
  • This analytics will allow you to track engagement metrics.
  • It will provide better deliverability to emails and maximize the chances of email being delivered to inbox.

Website: Mailgun

# 5) Amazon SES

Pricing: Pricing starts at $ 0.10 and offers flexible pricing options.


It is a platform for sending and receiving email. You can use this service to send transactional messages, marketing communications, notifications, and to receive incoming emails. Provides flexible pricing options. You have a flexible email receiving option.

You can decide which emails to accept.


  • This service allows you to create an email template.
  • Content filtering technologies.
  • Dedicated IP addresses.
  • Allows you to create rules for emails using the Configuration Sets feature.

Website: Amazon SES

# 6) Chuck

Price: The price is based on the number of blocks in which Block refers to 25000 emails. For 1-20 blocks, the price will be $ 20 per block. For 21-40 blocks, the price will be $ 18 per block. As the number blocks increase, the price will drop accordingly.


Mandrill is a transactional email provider for MailChimp users, provided by MailChimp. It can be used for data-driven emails such as e-commerce and personalized one-to-one messages.


  • Provides a searchable activity log.
  • You can customize the tracking options.
  • Depending on the sender and template, an email will be tagged automatically.
  • It allows you to generate easy-to-use reports and keep track of spam complaints.

Website: Mandril


The email API service plays a predominant role in today's tech world.

We can conclude the article Top Transactional Email API Services for developers, as all the tools are the best and each one provides the best possible features. Developers use most APIs for their applications.

Compared to pricing, SendGrid offers monthly plans and has a free plan as well. Mailjet also has monthly plans. You can use this service for free, up to 6000 emails per month. Mandrill offers a monthly plan, but it is based on the number of blocks.

Amazon has flexible pricing options. Mailgun's pricing policy is based on the number of emails sent per month and the number of validations required. SendGrid, Mailjet, and Mailgun have free plans with a limited number of emails.

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