Mailtrap

Twilio SendGrid's cloud-based email infrastructure relieves businesses of the cost and complexity of maintaining custom email systems. Twilio SendGrid provides reliable delivery, scalability & real-time analytics along with flexible API's.

Amazon SES eliminates the complexity and expense of building an in-house email solution or licensing, installing, and operating a third-party email service. The service integrates with other AWS services, making it easy to send emails from applications being hosted on services such as Amazon EC2.

Mailgun is a set of powerful APIs that allow you to send, receive, track and store email effortlessly.

Mandrill is a new way for apps to send transactional email. It runs on the delivery infrastructure that powers MailChimp.

It is a single module with zero dependencies – code is easily auditable. The email delivery is Secure using TLS/STARTTLS. You can use HTML content, as well as plain text alternative.

Postmark removes the headaches of delivering and parsing email for webapps with minimal setup time and zero maintenance.

Mailjet is a real-time Cloud Emailing platform: scalable, agile and flexible. Our unique algorithm boosts your deliverability and our platform provides in-depth insight so you can optimize more than ever.

SparkPost is the world’s #1 email delivery provider. We empower companies with actionable, real-time data to send relevant email to their customers which increases engagement and both top and bottom line revenue.

Litmus is a testing service for web and marketing professionals. It allows people to cross-browser test their websites, and test their email newsletters across a range of email clients and spam filters.

It is a modern email sending platform focused on providing the best developer experience. Build, test, and deliver transactional emails at scale.

Send email from your app with a simple API call, Sendwithus manages the rest. Templates, testing, data management, segments, and analytics are all accessible through a friendly dashboard.

Email on Acid is the most affordable, self-serve email testing platform in the world. We can help you maximize the success of your email marketing efforts by diagnosing and improving your renderability, deliverability, click-throughs and conversions.

It is an email testing tool for developers. You can configure your application to use MailHog for SMTP delivery. You can view messages in the web UI, or retrieve them with the JSON API.

Postal is a complete and fully featured mail server for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready for you to run on your own servers. Postal was developed by aTech Media to serve its own mail processing requirements and we have since decided that it should be released as an open source project for the community.

It is a premium email delivery and email relay solution that enables you to send and track high volume emails effortlessly. Integrate and start sending in minutes.

A new kind of transactional email service designed for developers to work faster and smarter with a powerful infrastructure to scale quickly.

It runs a super simple SMTP server which catches any message sent to it to display in a web interface. It catches all mail and stores it for display. It shows HTML, Plain Text and Source version of messages, as applicable.

For the best HTML e-mail delivery results, CSS should be inline. This is a huge pain and a simple newsletter becomes un-managable very quickly. This script is the solution.

Automate email and SMS tests, like account verification and password resets, using any language or testing framework using the Mailosaur API. Stop email being delivered to customers using fake SMTP servers.

Mailinator is a disposable email service that allows QA departments to test with 1000's of inboxes.

It is an email delivery service for your transactional and marketing emails. It replaces your email infrastructure so you don’t have to build, scale, and maintain these systems in-house. With an easy SMTP service you can start quickly, while our robust API gives you full control over email processing and reporting. Your transactional emails are delivered instantly and your marketing campaigns can be scaled to millions.

Transactional emails are the forgotten step child of internet marketers. Apostle.io empowers marketers to manage transactional emails themselves, as they would their list based campaigns. Preview, Update, Analyse and Test your transactional email all in one place.

It is the speedy transactional email delivery service that provides reliable Inboxing in less than a second, all with a very disruptive pricing model. Only pay for unopened emails.

CloudMailin allows you to receive any volume of incoming email via a Webhook. You are given an email address that will forward any incoming message to your app, as an HTTP POST, within milliseconds. You can also seamlessly check the delivery status of each of your incoming emails via the dashboard, bounce emails that you do not wish to receive and use your own domain name.

MailSlurp is an end-to-end email testing service. It has a web-app for managing your account and a REST API for sending and receiving emails from randomly generated email addresses.

It automates end-to-end email tests with a powerful GraphQL API and unlimited private email addresses and inboxes, test new user signups, transactional emails, drip campaigns, deliverability, spam scores, etc.

It is an SMTP server designed to run in your dev/test environment, that is designed to catch any email you or your application is sending, and display it in a web interface instead of sending to real world.

It is an Email testing and Email preview tool to test emails on several devices, screen sizes, and email clients. It checks your email for broken HTML, and accessibility issues, preview the email from the notification bar, displays the reading time of your email, and improves readability.

It is an online service that helps you create email templates and test them on dozens different physical devices and applications.

Disposable email and fake email capture for QA and development teams

It is a fully self developed solution, truly innovative in several respects, particularly scalable and configurable. This messaging solution offers the entire range of mail services — SMTP, POP3, IMAP, WebMail (Desktop and Mobile versions) — includes List server, Logging, Reporting, and FTP Backup modules and provides various, flexible administration options (including a central Web administration interface — WebAdmin).

Send emails that don't end up in the spam folder. Find out if your email is likely to trigger spam filters. Run a free email spam and security test in less than one minute.

It is a self-hosted open-source application that provides a REST interface on top of any email account you have access to read and send emails. Combining these features would give you a similar email sending experience you'd get from a transactional email service.

MTN Email Verifier is a high-performance tool for ensuring that your email communications reach the right inboxes every time. With the rise of email marketing and automated outreach, maintaining a clean list of deliverable email addresses is crucial. MTN Email Verifier combines syntax validation, domain checks, and server-level SMTP verification to deliver a reliable, real-time solution.

It is a transactional email management system designed to help businesses manage, send and track digital messages. Developers can integrate our bespoke API into software platforms and ensure that important transactional messages are delivered to users. Furthermore, it can track deliverability analytics on the personalized dashboard, so you can monitor the performance of your important transactional messages.

It is a one stop email testing platform which helps improve the emails being sent from application and reduce the costs associated with email workflow testing.

Dyspatch is an industry leading email production platform. Build engaging, interactive email templates in minutes, and collaborate with key stakeholders all within Dyspatch. Easily integrate with your existing email service providers.

It is an E2E email testing platform. It allows you to receive emails with code and automate email flows. You get a unique subdomain and access to unlimited custom email addresses.

It offers an easy way to deliver transactional and marketing emails via API or SMTP. It takes care of your sendings 24/7 for a reasonable price.

It is an open source tool for developers to set up customer notifications in less than 5 minutes. Just connect your database, set up event triggers, create content and connect to the service provider of your choice through DIY dashboard.

Mailit is a drop-in microservice for sending emails over a REST API.