OpenEMM

vs

Mailcheap

A set of powerful APIs that enables your application to send, receive and track transactional emails effortlessly. Mailgun provides a global infrastructure and industry expertise that helps you get your message across to the right person at the right time. The service is trusted by over 150,000 businesses including giants like Microsoft, MIT, NHL and Lyft.

Mailjet is an easy-to-use all-in-one email delivery service and marketing platform. Over130,000 marketers in 150 countries use Mailjet as their primary email marketing tool. With Mailjet users can manage everything from transactional emails via the Developer API to email marketing campaigns and email template building. The interface provided by Mailjet makes it really easy to monitor your marketing campaigns, and track open-rate, link clicks and customer related metrics.

MailerLite is an email marketing service and tool provider that brings features designed to help users grow subscribers and build stronger relationships. The experience provided by MailerLite is fresh, intuitive, and loved by many of its users. It includes everything from a drag & drop editor for email templates to automation features that can be used to stay connected with your customer-base.

Arguably the most popular email service in the world, Gmail provides a email inbox for over 1.5 billion users. With Gmail you can create an email account for free that manages emails and contacts in the same application. Gmail is web-base but provides clients for mobile devices and supports third-party programs that synchronize email content through POP or IMAP protocols.

World's largest secure email service providing end-to-end encrypted email accounts. ProtonMail is based in Geneva, Switzerland and protected by Swiss privacy laws. The software is openly developed with fully open source code.

Zoho Mail provides ad-free email hosting for business and organizations. It's comes with intuitive migration tools, along with 24/7 dedicated migration support to ensure smooth, lossless migration from your existing email provider. With Zoho Mail, your organization can manage all their email, calendar and contact needs. Since Zoho Mail is part of the Zoho's suite of online productivity, it's easy to extend the capability in to more parts of Zoho's offering and essentially run your entire business with Zoho. Zoho is provided as a Freemium software, where the free plan supports up to 5 users in an organization.