Using an Email Marketing API in 2023: Best Options with Examples

In this article, we will learn what is an email marketing API, how to use them, and some benefits. We’ll share our top recommendations and give examples.

Email remains one of the most effective and direct forms of communication for businesses to interact with customers. Using an email marketing API is very important when sending emails to your customers. 

There are plenty of email marketing service providers like Sendinblue, SendGrid, Mailgun, etc., through which you can send bulk emails to large groups of contacts without worrying about email deliverability issues.

email marketing API
Sending an Email with Marketing API

In this article, we will cover the following topics.

  1. Popular Examples of Email Marketing APIs
  2. What is an Email Marketing API?
  3. What can an Email API do?
  4. The Key Benefits of Email APIs
  5. Why should you use API in Email Marketing?
  6. What kind of Requests can I send via the API?
  7. Is an Email API Better than SMTP for Sending Bulk Emails?

Popular Examples of Email Marketing APIs

SendGrid Email API. 

Large companies such as Uber, Spotify, and eBay use this email marketing API. Its biggest advantages are the high delivery rate and analytics dashboards. The free plan includes 100 emails per day. 

Digging Deeper into SendGrid Email API.

Want to learn more about SendGrid? This is one of several articles where we’ve explored this email service in detail. Check out the following articles to go deeper and learn more about what is SendGrid and how to use it.


This email API stands out for its technical aspects and claims to have the best delivery rate in the industry. It also includes real-time metrics and performance alerts. The developer experience is also great. The trial plan consists of 500 emails per month, and the paid ones cost $20 for 30,000 emails and $205 for 300,000.


Sendinblue is an excellent choice as an email marketing API. It is fast, simple, and accessible to everyone. You can send millions of marketing emails in no time using Sendinblue’s robust Email API. Their email API can accept up to 120k emails per minute, and 99% of emails are processed in less than 2 seconds.

The free plan contains 300 emails a day, and the paid ones cost $20 for 20,000 emails a day and $1000 for the business plus plan.


Mailjet provides an easy-to-use platform for designing and sending email marketing campaigns, newsletters, and automated emails. You can design beautiful responsive emails in a few minutes using Mailjet Email Marketing API. You can start from scratch or select from a variety of pre-designed templates in Mailjet.

The free plan contains 6000 emails per month, and the premium plan costs $15 for 15,000 emails per month.


Mailchimp is a powerful marketing API service that provides you with intelligent marketing tools. It works with your favorite apps and web services and helps you do more with your email marketing. It can also find the tools you use or discover new ways for email marketing.
Mailchimp’s API client libraries and mobile SDKs make it so easy to work with Mailchimp Marketing and Transactional APIs with your language or platform of choice.

What is an Email Marketing API?

An email API (application programming interface) allows email service companies to access email services such as generating and sending transactional emails, managing email templates and lists, analyzing email marketing metrics, setting up domain authentication, and more.

An email marketing API is a programmatic interface used by users to access the features of an email marketing platform using code rather than a GUI. This is important for integrating email functionality into other software applications or websites.

What can an Email Marketing API do?

Many developers love working with email marketing APIs because they integrate well within the common software. You can create & manage contacts, lists, campaigns, and more. You can also use it to send out emails as well. Using an API can help automate your marketing processes so that you can focus more on your core business.

Sample actions you should expect from a marketing API

  • Send HTML-templated emails
  • Create and manage contacts
  • Create and manage lists
  • Create time-sensitive campaigns
  • Get lists of contacts and active campaigns

Using an Email API, you can create and send templates customized to an individual user based on their name, purchase, or other actions.

Here are the benefits you can get when using an Email Marketing API.

  • Get email analytics to track metrics and assess your email campaigns.
  • Create webhooks that send email event data to a CRM.
  • Operate at scale.

The Key Benefits of Any Email APIs

Using email APIs can save a lot of time for development teams by just providing one simple API to integrate with every provider. They offer a range of values for teams of any size:

The following are some key benefits of using Email APIs.

  • Ease-of-use
  • Fast implementation
  • Enable two-way communication
  • Cost Savings at scale
  • Service Reliability
  • High Deliverability
  • Email list management (e.g. unsubscribe requests)
  • Reports and Analytics Dashboards
  • Deep personalization (contextual APIs)
  • Embeddable email functionality for applications (contextual APIs)
  • Enterprise-grade security

Besides time savings and reliability improvements, using email APIs can also help build user-facing product enhancements faster, such as analytics, near-perfect email deliverability, and personalization.


Analytics is essential for any meaningful assessment of your email campaigns. The email API providers allow you to track important metrics such as the number of successful messages delivered, how many messages were rejected by an ISP, why the messages were not being delivered, how many recipients opened the message, or how many call-to-action links were clicked.


The deliverability, or the success with which your email messages reach their intended recipients at the intended time, depends on dozens of technical factors and contingencies. The web email API providers ensure maximum deliverability and can run their mail servers with expert supervision 24 hours a day and 7 days a week. 

They are responsible for mitigating any interruptions caused by Internet outages, natural disasters, distributed denial of service attacks, and various other network problems that could impact the delivery of your messages. Their service guarantees that you won’t lose any business because your servers were unable to respond or improperly configured.

Why should you use API in Email Marketing

You should use an API in email marketing because it will help you automate and streamline your processes. In addition, it helps you integrate within your entire platform for a seamless and optimized user experience. You will see an increase in profits while also getting better feedback from customers.

Also, using an API in email marketing can help you send bulk emails to your customers without any delay in sending them.

What kind of Requests can I send via the Marketing API

An API request is initiated when a user adds an endpoint to a URL and sends a request to the web server. 

For example, a web server receives a request from an application software (such as a mobile app), which the server evaluates and returns to the client.

The API endpoints are the communication points between an API and any other system. The place from which an API can access the resources it needs is known as an endpoint. 

When using an API, you can manage and update by issuing the following requests:

  • POST creates a new resource
  • GET requests a resource
  • PUT replaces a resource
  • DELETE deletes a resource

These requests use standard Hypertext Transfer Protocol (HTTP) methods.

Sample of common email marketing API requests .

Get all marketing emailsCreate a marketing emailUpdate a marketing emailDelete a marketing email
Get a marketing emailClone a marketing emailRestore a deleted marketing emailDelete a contact list
Get a campaign data for a particular Campaign                 Delete a campaign
Get event data for a campaign, or recipientRemove a contact from a list
Get event data for a specific event
Get revisions of a marketing email
Determine the buffer of a marketing email
Get the statistics for a marketing email
Get all marketing email statistics
API requests Table

Is an Email API Better than SMTP for Sending Bulk Emails?

We recommend that you use an email API over an SMTP relay to send bulk emails because it is easier to integrate, generally cheaper, and less to manage. There are times when you may need to use an SMTP relay due to the project requirements and many email services do provide that option when needed but you should select the API whenever possible.

The SMTP relay is commonly used and is based on the Simple Mail Transfer Protocol. The web APIs, however, are better than the SMTP relay method in many use cases and have also increased in popularity. 

Email APIs help you in email deliverability by making messaging easier for both senders and recipients. An API ensures that a message is sent to a predetermined audience.

If you are tech-savvy, then using APIs is a more attractive option as it allows you to customize and modify settings to suit your needs.

In general, the option to use SMTP or API entirely depends on your needs and the capacity of your application, platform, eCommerce, or website. Despite the earlier advent of SMTP and the more modern universality of the API service architecture, both protocols have their adherents.

SMTP relay is quite reliable and sustainable, but it does not guarantee high-speed delivery. Web API, on the other hand, provides expanded functionality, but it’s more complex to use. Weigh all the pros and cons so your final decision will be the right one. Good luck!

This PHP article explains what API is in email marketing. It also explains what an API can do, the key benefits of using an API, and why you should use it for sending marketing emails.

The article also explores most popular APIs used for email marketing. And it also explains which email transfer is better for sending bulk emails.

I hope you’ve enjoyed the article. Stay tuned for more at FuelingPHP

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