SMTP

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.

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

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.

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.

We offer one platform that covers all email-related needs in one place: testing, sending, and in-depth tracking to control how email infrastructure works and performs.

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.

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

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

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 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.

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.

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.

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.

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).

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 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 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.