In API Last updated:
Share on:
Cloudways offers managed cloud hosting for any size business to host a website or complex web applications.

Email is still prevalent and forms an integral part of your business and online life.

No matter what people say and how many new communications are developed, email continues to be the main mode of communication, especially in the business world.

Almost everyone has an email, but they may not have a common chat application. It unifies us and connects with people across the world with just a click.

According to Statista, around 306 billion were exchanged every day globally in 2020, and this figure is expected to reach 376 billion by 2025.

This clearly shows that email is not going anywhere soon, and the reasons justify its existence clearly (which we will cover in the next section).

Why Do Businesses Need to Send Emails?

Emails have transformed the business world by eliminating communication barriers between customers. As a result, they can easily share information with stakeholders and clients effectively and instantly irrespective of their location on the global map.

From small and medium-scale businesses to enterprises, all use emails even if they incorporate other channels like messaging apps, chats, Slack, etc.

It has become a notion that every business must be using an email address. Hence, when someone wants to reach out to a company, they prefer communicating with them via email at first.

It’s a common mode of communication and probably the easiest one. This is why every business such as eCommerce, SaaS, forums, healthcare, etc., uses a valid, active email address to execute smooth business communication.

  • Emails look professional, and they are great conversation starters
  • They are cost-efficient. Even if you use a business email, the cost incurred is relatively lower than call charges, especially for international calls
  • It works instantly provided both sides have a stable internet connection
  • Emails can be an efficient way to market new products/services, newsletters, send a notification when a user’s subscription plan is about to end, and much more

Talking about business emails, two types of them exist – marketing emails and transactional emails.

Transactional emails usually incorporate the data the receiver wants, and they are typically automated notifications.    These transactional emails are sent to a recipient in response to a trigger such as user signups, purchase receipts, ‘thank you’ or ‘welcome’ emails, password changes, notifications, and so on.

Sending transactional emails is possible by using your server via an SMTP protocol (Simple Mail Transfer Protocol).

However, it’s not that ‘simple.’

You need to struggle a lot with formatting the emails while complying with a set of email delivery guidelines, failing to which your email may end up in the user’s spam folder.

Using an email API can solve this problem.

It does all the heavy lifting by managing those email formatting nuisances and delivery compliance. This is why it makes sense to leverage a managed Email API solution compared to a self-hosted solution to achieve better delivery and reliability.

Also, there are plenty of available email API choices, even from respected providers, which may confuse you.

Don’t worry; we have chosen some of the top email APIs that are reliable and can be a good fit for your business.


SMTP is a reliable relay and email delivery service that allows users to track high-volume emails and send them. It maintains an impeccable reputation in the market by maintaining high delivery rates and filtering out spam emails. SMTP also offers super-fast delivery, ensuring no latency while optimizing sending according to the ISP protocols and benchmarks.

The reliable email relay services offer Transactional Email and Email API.

Transactional Emails are powerful addition allowing users to receive payment or purchase confirmation emails, account creation emails, and platform notifications. It automatically sends the email to the user, such as acknowledgment, warning, notification, or confirmation.

SMTP Email API is a bit different as it allows reliable email relay infrastructure. It is a robust and RESTful API that is easy to integrate and flexible with relay settings. It offers human support, clear documentation and is built with flexibility.

SMTP pricing starts from $25 per month, offering 50,000 emails, email Relay API, shared IP, reputation defender, detailed reporting, and 24/7 support. The price will increase with the number of emails per month.


mailersend, the industry’s top cloud-based email API, makes it simple to send and manage emails from your web app, handle email campaigns, analyze their progress, and get in-depth reports to keep tabs on them.

It offers a variety of features such as personalization, bulk sending, attachments, automated email delivery, spam complaints, and bounce notifications, among many others. With their built-in reporting capabilities, you can monitor the performance of your campaign and gauge its efficacy.

This tool works well for managing emails sent frequently and swiftly, such as email campaigns, bills, daily updates, newsletters, etc.

Because of its adaptability, it can be integrated with many different programming languages, including PHP, Node.js, Golang, Python, Ruby, Java, and Laravel.

Inbound routing, one of its distinctive features, enables processing incoming emails and delivering them straight to the app so users can instantly reply from the app.

Spam is one of the most common problems that email marketing attempts to address, and mailersend handles it by utilizing the security protocols SPF, DKIM, and DMARC.

Key Features

  • Quick integration with existing libraries to send emails instantly
  • Adopt the necessary changes and abide by the suppression list to prevent spam.
  • Personalized emails in bulk and real-time using dynamic email templates
  • Bulk transactional SMS can be sent from a known phone number.

A maximum of 12000 emails and a limited number of features are available for free usage; if you need additional features and email quota, you can upgrade to the premium and enterprise editions.


Mailmodo is one of the best you can get for sending transactional emails to boost your business.

You can cover all the grounds with emails addressing onboarding, cart recovery, password reset, account notifications, and purchase receipts.

Besides, you won’t have to code your way out of it. Instead, benefit from the pre-made templates (AMP+HTML) and drag-and-drop builder to give your emails a personal touch.

Additionally, the automation makes your life easy to send relevant emails based on specific triggers.

The cherry on the cake is the Mailmodo integrations to make use of your existing marking tools.

Moreover, you can check out the analytics section to improve your email campaign every time.

Lastly, you can try this with Mailmodo’s generous free tier to send 10k emails/month and scale as required.


Strengthen your customer trust and improve your communication strategy with a reliable email API of SendGrid. With superior strategic and technical support, you can build an email solution and monitor it.

SendGrid uses the purpose-built MTA for delivering billions of emails/month for different brands such as Uber. Hence, you can rely on their cloud-based, globally distributed architecture. SendGrid offers certain features like secure account management, fast troubleshooting, and an intuitive UI to save your time during data analysis.

This platform is designed for developers by developers, and you can integrate with their SMTP and RESTful APIs to make sure of quick email delivery in minutes. Many libraries support your interactive documentation along with programming languages like Java, C#, Python, PHP, Go, Node.js, Ruby, and Curl.

Get optimal email deliverability using recommendations and streamlined tools to help you create effective programs. You get custom DKIM, dedicated IPs, feedback loops, and SPF records. Their delivery experts on ESPC, EEC, M3AAWG, and DMA offer consultation whenever you need support.

SendGrid has even partnered with top mailbox providers like Microsoft, Verizon Media, and Gmail. It empowers developers, business leaders, and marketers to collaborate effectively. You can easily configure your account settings, create templates, send them programmatically, troubleshoot delivery issues, diagnose them quickly, and check the performance.

SendGrid takes security seriously, which is why they offer a lot of active measures to protect your account and preserve your brand’s reputation. You can control your account access with API keys, IP access management, 2FA, and Teammate permissions.

Also, protect your data with enforced and opportunistic TLS encryption and Event Webhooks along with compliance with GDPR and SOC 2 Type II regulations. Here, you have the option for a free subscription to enjoy sending 100 emails/ day.

Elastic Email

With the ultra-fast infrastructure, scale to 100 million+ emails every month using the most reliable and cost-effective delivery engine, Elastic Email.

Integrate the tools easily into your website/app by using their API or receive an API key by creating an account and set it up in no time with their customary SMTP Configuration. Next, you will have access to send marketing and transactional emails from your website or app.

Control all your integrations and safeguard your email sending processes using the option of multiple API keys or specific Access Levels. Get instant notification about the bounce, errors, clicks, opens, and a lot more, which is visually represented to make smart business decisions and maximize email ROI. You get webhooks and multiple options for plugins and integrations to expand your functionality.

Their pricing starts from $0.10 per 1000 emails plus $0.40 per day when you exceed the limit for features like HTTP and SMTP access, landing page editor, SMS API, and more.


Send bulk or transactional emails effortlessly with the flexible SMTP relay and HTTP API of Mailgun. Set up email integration quickly, schedule it, execute A/B testing, and track the sent emails through this email API.

They have built a scalable infrastructure to send any number of emails from just 10 to 10 million. You can create your email solution using popular languages like Ruby, Java, PHP, C#, Python, and more.

With advanced analytics, you can track your emails’ performance, such as engagement metrics like clicks, opens, etc. You can also determine the favorable time to send emails using hourly data and dig deeper into performance by the mailbox provider, location, and device.

If your email fails to deliver, you can diagnose the issue with ease with their detailed logs. Get better email deliverability by sending them from your own domain using DKIM, DMARC, and SPF customization. You can also protect your emails from bad players with isolated sending domains and dedicated IPs.

With their powerful routing features and email parsing, inbound processing won’t be difficult. You can receive emails that are fully converted and parsed to UTF-8 and turn incoming emails’ complicated MIME data into straightforward JSON.

Their Pay-As-You-Grow plan includes 5000 free emails/month for 3 months, and then you can choose what plan works for you.


Looking for an email API solution that you can completely rely on?

Switch to Postmark.

Start sending emails using this email API in a few minutes. They offer a robust list of client libraries in various programming languages such as Java, Python, PHP, and more that help you integrate with their API.

You can use their reliable and secure SMTP service to unlock Postmark’s brilliant and prompt email delivery for simpler applications. You can organize all your transactional emails by logical groups, also known as servers, representing a different environment or application. This way, you get fully focused reports, organized user permissions, and limited API keys.

Adding DNS records is simple with Postmark that guides you on setting up those records and protecting your domain’s reputation while ensuring higher email deliverability. Additionally, you can integrate DMRC, SPF, and DKIM support as well.

Unlock your application-driven emails’ full potential using clear, developer-friendly documentation. You can also utilize API Explorer to test API calls and check responses with real-time data. You can use webhooks to send alerts when an email gets delivered, bounced, opened, or clicked.

Build and manage email templates easily from Postmark, plus it allows you to manage domains, servers, templates, sender signatures, and retrieve stats. Apart from all this, they help in smooth migration to Postmark from other providers.

Their pricing starts from $10 for 10,000 emails per month with an additional $1.25 for 1000 emails if you exceed the limit.

Amazon SES

The high-scale inbound & outbound email service in the cloud, Amazon SES (Simple Email Service), is flexible, scalable, and cost-effective and allows developers to send emails from any application.

The mail authentication options and reliable IP deployment help drive better deliverability while protecting the sender’s reputation and sending analytics to measure each email’s impact. Configure this email API quickly for various use cases like transactional and marketing emails or mass communications. You can integrate it by using either APIs, SMTP, or Amazon SES console.

Amazon SES enables email receiving, so you remain connected to your customers. Their relationship with experts such as M3AAWG allows you to improve email delivery using industry best practices. You can also use your reputation dashboard to see anti-spam feedback and performance metrics to maximize deliverability.

Track email opens, clicks, email deliveries, feedback loops, and bounces to determine the email outreach effectiveness. Apart from DKIM and SPF, VPC support makes an email sending secure from any application. Amazon SES is available with in-region compliance (C5, IRAP), global certifications (ISO, Fed-Ramp, and GDPR), and HIPAA eligibility.

Do you know you can also use AWS SES for marketing emails to lower the email marketing cost?

Bonus Points: How to Choose an Email API?

Reading about all of the above-mentioned email APIs, you will find that their basic features are quite similar. In that case, you might be stuck with two or three products that may appeal to you.

To narrow it down, look at some of the points that can help you get the email API you actually desire.

  • Deliverability: Make sure the provider you choose offers excellent API uptime (99.99% and more is best) along with high performance. You must also inspect their delivery practices like compliance to ensure your emails don’t end up in the spam folders.
  • Speed: Test how fast their API performs in terms of sending and receiving messages. The more time it takes, the lower the speed will be.
  • Usability: The email API must be easy-to-use by both beginners and advanced users.
  • Price: Choose an email API based on your budget. If you are a larger business or enterprise, you can use SendGrid. But if you are a start-up or heavy on the budget, you can choose cost-efficient solutions like Amazon SES.


Email 📧 is going to stick around for long, if not forever. It helps you establish professional business communications with your clients and customers and allows you to market your products and services.

And when emails are such a big part of your business, choosing an efficient email API is imperative.  Thus, go for any one of the above email APIs that can offer higher deliverability, speed, and ease of use.

Next, explore some of the best email verification API.

Share on:
  • Durga Prasad Acharya
    Durga Prasad Acharya is a Senior Technical Writer who loves writing on emerging technologies such as AI & ML, Cybersecurity, Hosting, SaaS, Cloud Computing, Gaming and more. Besides writing, he’s a web designer and passionate about…

Thanks to our Sponsors

More great readings on API

Power Your Business

Some of the tools and services to help your business grow.
  • The text-to-speech tool that uses AI to generate realistic human-like voices.

    Try Murf AI
  • Web scraping, residential proxy, proxy manager, web unlocker, search engine crawler, and all you need to collect web data.

    Try Brightdata
  • is an all-in-one work OS to help you manage projects, tasks, work, sales, CRM, operations, workflows, and more.

    Try Monday
  • Intruder is an online vulnerability scanner that finds cyber security weaknesses in your infrastructure, to avoid costly data breaches.

    Try Intruder