Aritic Mail - Ariticmail is a transactional email delivery API for applications and enterprises.
The Big Book of Churn - The definitive guide to customer churn reduction
SendWithUs - Take control of your transactional email. sendwithus is the missing tool for marketers to manage and optimize transactional emails.
Customer.io - We make it easy to send emails triggered by user behavior. Build, measure and improve your emails to activate and retain users
Amazon SES - Scale your business email & marketing messages with Amazon Simple Email Service (SES), a cost-effective and reliable cloud email service. Sign up today.
Postmark - Postmark is the easiest and most reliable way to be sure your important transactional emails get to the inbox. Simply & reliably parse recieved email to JSON for your webapp.