1. Marketing Software

  2. Transactional Email Software

Mailgun

Give your app SMTP functionality with a complete set of APIs for every major programming language

SMTP2GO

Reliable and automatic email delivery application that manages the inboxing process for you

Amazon Simple Email Service (Amazon SES)

Send bulk emails without compromising your delivery rate and manage email marketing campaigns at scale

Mailchimp Transactional Email (formerly Mandrill)

A full-stack email marketing platform that lets developers use APIs to better contextualize advertising messages

Postmark

An email server specifically built for transactional emails with a very high accuracy rate